When adding nested list elements in the content, the user is able to go to parent element, press enter and add a sibling element.
This element, as expected has a br tag that allows user to type text, but deleting this tag causes the list item to be not editable and the user is forced to go to HTML mode to modify the HTML code manually.

If a RadPane has a scrollable content (it does not fit into its dimensions), under iOS and Android, you should tap and hold on a textbox to start typing in it. If you have a RadComboBox in the same scenario, it is not possible to expand its items under Android Chrome and Opera.

Note: the issue is not reproducible, if that same content is loaded through the RadPane ContentUrl property.

This issue is happening due to the insertion of the /n character in the comment editable area. This character breaks the logic of some content filters and they are replacing the greater than and less than characters in the HTML mode. 

Possible workaround is to disable the ConvertCharactersToEntities filter:

C# example:
RadEditor1.DisableFilter(EditorFilters.ConvertCharactersToEntities);

VB example:
RadEditor1.DisableFilter(EditorFilters.ConvertCharactersToEntities)

The link manager provides approach to add anchors with unique ID and name. The name should be inserted dynamically in a collection shown in the "Existing Anchor" drop down. For some reason this dropdown is never populated without reloading the RadWindow.

Possible resolution is forcing the dialog to reload on each show:

<telerik:RadEditor ID="RadEditor1" runat="server" OnClientCommandExecuted="OnClientCommandExecuted">
</telerik:RadEditor>

<script type="text/javascript">
    function OnClientCommandExecuted(editor, args) {
        var command = args.get_commandName();

        if (command === "LinkManager") {
            var dialogOpener = editor.get_dialogOpener();
            var linkManager = dialogOpener._dialogContainers[command];
            linkManager.add_show(function () {
                linkManager.reload();
            });
        }
    }
</script>

Steps to reproduce:

1) Create a vertical RadMenu with one item only
2) Hover the item

Result: slight displacement

I am doing a bin deployment on a web site for the following assemblies...

Telerik.Windows.Documents.Core
Telerik.Windows.Zip
Telerik.Windows.Documents.Fixed
Telerik.Windows.Documents.Flow
Telerik.Windows.Documents.Flow.FormatProviders.Pdf
Telerik.Windows.Documents.Spreadsheet
Telerik.Windows.Maths
Telerik.Windows.Documents.Spreadsheet.FormatProviders.OpenXml
Telerik.Windows.Documents.Spreadsheet.FormatProviders.Pdf

I recently used the upgrade wizard, and it successfully updated the versions for these assemblies, but it did not update the version numbers in the Web.config.  I manually removed the version number completely from Web.config, and it seems to work fine.

The new scaffolding capabilities in ASP.NET web forms are great for productivity.

I'd like to see Telerik-specific scaffolding that substituted Telerik controls.

Caused by 

https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/GbVcuwg_QjM/discussion%5B1-25%5D
https://stackoverflow.com/a/45495974
https://stackoverflow.com/a/45746963

Workaround attached

Looks like it is a typo in the Telerik code. When I use skin web20 on the page and RadNotification I get exception :

An error occurred processing a web or script resource request. The requested resource 'pTelerik.Web.UI.Skins|Telerik.Web.UI.Skins.Web20Lite.Notification.Web20.css' does not exist or there was a problem loading it.

Note, there is "p" before Telerik namespace. 

Telerik,

Respectfully recommending a guide feature for new users for our Application (Something similar to what this website does https://shepherdjs.dev/) Users can essentially step through controls we have on the page and we have a small verbiage/info for them that is easily digestible. 

Would help tremendously on onboarding new users and documenting new features. 

The R2 2021 update causes all controls in Classic RenderMode to change their layout and size due to different font-size, font-family and line-height. 

Fixing this change is planned for the upcoming Service Pack.

In the meantime, you can use the styles in the attachment. Due to the fact that the selectors are the same as the ones in the built-in skin, you need to load them either in the beginning of the <body> or using RadStylesheetManager. If you are using the StylesheetManager, ensure you set a big OrderIndex for the entry:

<telerik:RadStyleSheetManager runat="server"  >
    <StyleSheets>
        <telerik:StyleSheetReference Path="fixes.css" OrderIndex="99999" />
    </StyleSheets>
</telerik:RadStyleSheetManager>

Loading the styles in the <head> tag's markup would not work as the Telerik stylesheets are added programmatically at the end of the <head> tag, meaning it will override the preceding files that have the same selector.

The attachment contains a file for each skin and inside it, it has all styles grouped by control. That means you can load only the file for the skin you are using and optionally remove the styles for controls that you are not using. Keep in mind that some more complex controls(e.g. Grid, Editor, DropDownTree, etc.) contain other Telerik controls as child controls, so you would need to keep the styles for the child controls also.

Please excuse us for the inconvenience caused and thank you for your understanding.

Certain controls just add bloat to a page.  Like the RadListView is a GREAT control to use inplace of the asp Repeater, but I find I often don't use it (or limit it's use) because it brings down 99.9% useless client scripts.  Most of the time, especially in Sitefinity its a server-side render-only control.  Just used to show data...we don't need ANY client manipulation.