The issue is replicated when the spreadsheet is higher than the screen height. To reproduce it, scroll the page and click the last visible cell. 

Result: The page is scrolled to the beginning of the Spreadsheet element

Expected: The page is not scrolled

<telerik:RadSpreadsheet runat="server" ID="RadSpreadsheet1" Height="2000px" Width="100%">
</telerik:RadSpreadsheet>

In lightweight the issue is not observed:

<telerik:RadRibbonBar runat="server" RenderMode="Classic">
    <Tabs>
        <telerik:RibbonBarTab Text="home">
            <%-- duplicate the group and items inside to replicate more easily --%>
            <telerik:RibbonBarGroup Text="Documents">
                <Items>
                    <telerik:RibbonBarButton Text="Item 1" />
                </Items>
            </telerik:RibbonBarGroup>
        </telerik:RibbonBarTab>
    </Tabs>
</telerik:RadRibbonBar>

This issue seems fixed for AzureAD while it is not for WSFederation authentication

• https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/issues/495

It seems the final solution is to manually remove the entries with null/empty key from the submitted form

Reproduction:

<telerik:RadButton ID="RadButton1" runat="server" Text="Submit" EnableEmbeddedSkins="false" EnableEmbeddedBaseStylesheet="false"/>
<telerik:RadCheckBox ID="RadCheckBox1" runat="server" Text="CheckBox" Skin="Default" />

Workaround:

<telerik:RadButton ID="RadButton1" runat="server" Text="Submit" Skin=""/>

The full stract trace of the error can be found in the attached file.

When adding formatting to texts while selecting whole elements, some elements are not included in `isBlockElement` function such as <col> or <colgroup> in a way those elements get wrapped in formatting tags such as <strong>

How to Reproduce:

   Create a table in editor

```html
  <span>Outside text</span>
  <table>
     <colgroup>
          <col></col>
     </colgroup>
    <tbody>
       <tr>
            <td>Inside text</td>
        </tr>
    </tbody>
  </table>
```

Select the inside text and outsite text in editor and click for applyng BOLD for instance.

colgroup tag gets wrapped in <strong> tags.

Some of html5 tags are missing from the isblockelement check as well such as 'article', 'aside', 'audio', 'canvas', 'details', 'figcaption', 'figure', 'footer', 'header', 'hgroup', 'nav', 'output', 'section', 'video'

Repro steps: 
- use the editor below and the attached Word document in the archive at the end
- copy the document content in the editor
- clean the word formatting
- select some of the content (e.g., one paragraph)
- click the format stripper dropdown and choose Strip Span Elements
- run get_html(true) in the console

Expected: spans are stripped only from the selected content

Actual: nothing is stripped. Changing to HTML mode and back to Design fixes this, so you should not use that to check the HTML

        <telerik:RadEditor RenderMode="Lightweight" runat="server" ID="RadEditor1">
            <Tools>
                <telerik:EditorToolGroup>
                    <telerik:EditorTool Name="FormatStripper" />
                </telerik:EditorToolGroup>
            </Tools>
        </telerik:RadEditor>


WORKAROUNDS:

For the majority of cases you can set up automatic stripping of span elements when pasting from Word, so your users do not need to do that themselves. Here is an example:

<telerik:RadEditor RenderMode="Lightweight" runat="server" ID="RadEditor1"
    StripFormattingOptions="ConvertWordLists, MSWordNoMargins, Span">
    <Tools>
        <telerik:EditorToolGroup>
            <telerik:EditorTool Name="FormatStripper" />
        </telerik:EditorToolGroup>
    </Tools>
</telerik:RadEditor>

You can read more on how stripping MS Word content works in the following demo, and play around with the various options to see what works best for your case: http://demos.telerik.com/aspnet-ajax/editor/examples/cleaningwordformatting/defaultcs.aspx and in the following documentation article: https://docs.telerik.com/devtools/aspnet-ajax/controls/editor/managing-content/pasting-content/clean-ms-word-formatting

There are also two possible code workarounds so advanced users can retain more control over the HTML without switching to the HTML mode themselves.
The second is likely to be a tad faster with large content, but the first is likely to produce better user experience.

1) this changes the mode to HTML and back to design with each paste so that the stripping tool can work with the selection


<telerik:RadEditor RenderMode="Lightweight" runat="server" ID="RadEditor1"
     OnClientCommandExecuted="OnClientCommandExecuted">
    <Tools>
        <telerik:EditorToolGroup>
            <telerik:EditorTool Name="FormatStripper" />
        </telerik:EditorToolGroup>
    </Tools>
</telerik:RadEditor>
<script>
    function OnClientCommandExecuted(sender, args) {
        if (args.get_commandName() == "Paste") {
            sender.set_mode(2);
            setTimeout(function () {
                sender.set_mode(1);
            }, 50);
        }
    }
</script>

2) this one is a workaround that allows the stripping tool to work without mode change, but it will not operate with the selection but with all the content


<telerik:RadEditor RenderMode="Lightweight" runat="server" ID="RadEditor1"
     OnClientCommandExecuting="OnClientCommandExecuting">
    <Tools>
        <telerik:EditorToolGroup>
            <telerik:EditorTool Name="FormatStripper" />
        </telerik:EditorToolGroup>
    </Tools>
</telerik:RadEditor>
<script>
    function OnClientCommandExecuting(sender, args) {
        if (args.get_commandName() == "StripSpan") {
            sender.set_html(sender.get_html(true));
        }
    }
</script>

This behavior can be observed with the example below.

https://demos.telerik.com/aspnet-ajax/listview/examples/paging/pagingwithraddatapager/defaultcs.aspx

Enter a value for Page and click the Go button. Either the page will be updated to the expected page or the pager will fail to change the page. Clicking Go again usually seems to work if it failed. It may take a several tries to observe this behavior as it happens inconsistently.

Bug report

When I use TimePicker in GridDateTimeColumn it works fine in a normal browser but fails on mobile with the following error "Value must be 00:00 or earlier"

This works fine from Firefox, but when I use a mobile browser I get the following error "Value must be 00:00 or earlier" or "Value must be 12:00 AM or earlier".

Reproduction of the problem

Markup

<telerik:RadGrid ID="RGTimesheet" runat="server" OnNeedDataSource="RGTimesheet_NeedDataSource" RenderMode="Mobile"
    AllowAutomaticInserts="True" AllowAutomaticUpdates="True" AllowAutomaticDeletes="True"
    Skin="MetroTouch"
    Width="100%" AllowSorting="True" GroupPanelPosition="Top">
    <ClientSettings>
        <Scrolling AllowScroll="True" UseStaticHeaders="True"></Scrolling>
    </ClientSettings>
    <MasterTableView AutoGenerateColumns="False" CommandItemDisplay="Bottom" DataKeyNames="OrderID" ShowFooter="True">
        <Columns>
            <telerik:GridEditCommandColumn ButtonType="FontIconButton">
            </telerik:GridEditCommandColumn>
            <telerik:GridClientDeleteColumn ButtonType="FontIconButton">
            </telerik:GridClientDeleteColumn>

            <telerik:GridDateTimeColumn DataField="Start" DataType="System.TimeSpan" EditDataFormatString="hh:mm:ss tt" HeaderText="Start" SortExpression="Start" UniqueName="Start" PickerType="TimePicker">
            </telerik:GridDateTimeColumn>
            <telerik:GridDateTimeColumn DataField="Finish" DataType="System.TimeSpan" HeaderText="Finish" SortExpression="Finish" UniqueName="Finish" PickerType="TimePicker">
            </telerik:GridDateTimeColumn>

        </Columns>
        <EditFormSettings>
            <EditColumn UniqueName="EditCommandColumn1" ButtonType="PushButton">
            </EditColumn>
        </EditFormSettings>
    </MasterTableView>
</telerik:RadGrid>

C# - Markup

private DataTable OrdersTable()
{
    DataTable dt = new DataTable();

    dt.Columns.Add(new DataColumn("OrderID", typeof(int)));
    dt.Columns.Add(new DataColumn("Start", typeof(TimeSpan)));
    dt.Columns.Add(new DataColumn("Finish", typeof(TimeSpan)));

    dt.PrimaryKey = new DataColumn[] { dt.Columns["OrderID"] };

    for (int i = 0; i < 10; i++)
    {
        int index = i + 1;

        DataRow row = dt.NewRow();

        int hours = DateTime.Now.Hour;
        int minutes = DateTime.Now.Minute;
        int seconds = DateTime.Now.Second;

        row["OrderID"] = index;
        row["Start"] = new TimeSpan(hours, minutes, seconds);
        row["Finish"] = new TimeSpan(hours+index, minutes, seconds);

        dt.Rows.Add(row);
    }

    return dt;
}


protected void RGTimesheet_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
    RGTimesheet.DataSource = OrdersTable();
}

Simple reproducible is attached to illustrate the problem.

A workaround may be replacing RadButtons that invokes such postbacks with regular buttons and using a form decorator

Alternatively, you can simply disable the handler URL encryption

You can also put the following in the global.asax file to prevent the version from rendering on the page markup
        protected void Application_BeginRequest(object sender, EventArgs e)
        {
			System.Web.HttpContext.Current.Items["_!TelerikVersionStampRendered"] = true;
        }
or you can add the same line in a global Page_Load handler (e.g., in a base page class or in the master page your project uses)

If AllowPaging, AllowScroll and UseStaticHeaders are set to true, then there will be 2 empty <th> elements

workaround: 
    <ClientSettings>
...
        <ClientEvents OnGridCreated="OnGridCreated" />
    </ClientSettings>

<script>
    function OnGridCreated(sender, args) {
        var emptyth = $telerik.$(sender.get_element())
            .find("th").filter(function (ind, item) { return item.textContent == "" });
        // alert(emptyth.length)
        emptyth.append("<span style='display:none'>Hidden empty table header</span>")
    }
</script>

Images that reside in the grid will get resized (scaled down with about 3-5 %) which might cause issues, specially if exporting bar-codes, thus the bar-code scanners won't be able to read them.

Current workaround is to use the Telerik Documents Processing Library  and build the table manually where the images are inserted without changing the size.

Here is an example:

        protected void RadGrid1_InfrastructureExporting(object sender, GridInfrastructureExportingEventArgs e)
        {
            Telerik.Web.UI.ExportInfrastructure.Table table = e.ExportStructure.Tables[0];

            Workbook workbook = new Workbook();
            workbook.Worksheets.Add();

            Worksheet worksheet = workbook.ActiveWorksheet;


            foreach (var row in table.Rows)
            {
                if (row.Index > 1)
                {
                    worksheet.Rows[row.Index - 1].SetHeight(new RowHeight(55, true));
                }

                foreach (var cell in row.Cells)
                {
                    if (row.Index == 1 || cell.ColIndex != 2)
                    {
                        worksheet.Cells[cell.Index.Y - 1, cell.Index.X - 1].SetValue(cell.Value.ToString());
                    }
                    else
                    {
                        FloatingImage image = new FloatingImage(worksheet, new CellIndex(cell.Index.Y - 1, cell.Index.X - 1), 0, 0);
                        Stream stream = File.Open(Server.MapPath(cell.Value.ToString()), FileMode.Open);
                        using (stream)
                        {
                            image.ImageSource = new Telerik.Windows.Documents.Media.ImageSource(stream, "jpg");
                        }
                        worksheet.Shapes.Add(image);
                    }
                }
            }

            byte[] data;

            using (MemoryStream ms = new MemoryStream())
            {
                XlsxFormatProvider xlsProvider = new XlsxFormatProvider();
                xlsProvider.Export(workbook, ms);
                data = ms.ToArray();
            }

            Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            Response.Headers.Remove("Content-Disposition");
            Response.AppendHeader("Content-Disposition", "attachment; filename=" + RadGridLista.ExportSettings.FileName + ".xlsx");
            Response.BinaryWrite(data);
            Response.End();
        }

Workaround 1) Use .resx files as the attached ones 

Workaround 2) Set properties to ViewState
        RadMonthYearPicker1.MonthYearNavigationSettings.ViewState["_mCancelButtonCaption"] = "my cancel";
        RadMonthYearPicker1.MonthYearNavigationSettings.ViewState["_mTodayButtonCaption"] = "my today";
        RadMonthYearPicker1.MonthYearNavigationSettings.ViewState["_mOkButtonCaption"] = "my ok";

There are missing keys in the resx files and the resource files are not applied correctly. More info here: 

• https://www.telerik.com/forums/localizing-radcolorpicker-using-resource-files