http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
Clear content;
Add a table;
Open context menu by selecting a cell in the table;
Open Cell Properties;
Open More cell Styling;
Chose Background color;
Change it and click OK
Click OK in Table Wizard.
Actual: No background color is applied. 

Please follow these steps to reproduce the issue:

1. Open RadEditor Demo: https://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
2. Choose a word that is present in the text (e.g. "Barcelona").
3. Open "Find And Replace" dialog.
4. Click on the "Replace" tab.
5. Write "Barcelona" or any other chosen word in the "Find" field.
6. Write something in the "Replace With" field (e.g. "Replacement").
7. Select the "Up" Direction in "Search Options".
8. Click "Replace All".

Actual Result: The "The search string was not found." message is displayed and the substrings ("Barcelona") are not replaced.
Expected Result: All occurrences of the substring are replaced.

Note that this functionality seems to be working if the "Down" direction is chosen.
Update: I would like to add that the issue is not only with Replace All. The same bug is happening with "Replace" with both "Up" and Down" directions.

The execution of the getContextMenuByTagName inside the oncontextmenu event of RadEditor hides the context menu once it is shown. This happens in Lightweight render mode only and when the UseRadContextMenu is enabled:

<telerik:RadEditor ID="RadEditor1" runat="server" ContentAreaMode="iframe" OnClientLoad="OnClientLoad">
    <Content>
        <table>
            <tr>
                <td>test</td>
            </tr>
                <tr>
                <td>test</td>
            </tr>
                <tr>
                <td>test</td>
            </tr>
        </table>
    </Content>
</telerik:RadEditor>
<script>
    function OnClientLoad(editor, args) {
        editor.attachEventHandler("oncontextmenu", function (e) {
            var oSelection = editor.getSelectedElement();

            setTimeout(function () {
                var tdMenu = editor.getContextMenuByTagName("TD"); //the call of getContextMenuByTagName closes the context menu when lightweight render mode is used. You can slow down the closing with the setTimeout function or by settign UseRadContextMenu to false.

            }, 1000);
        });

    }
</script>

"The size of the uploaded file exceeds max size allowed" is thrown even if the file is under the specified maximum upload file size.

The error is reproducible in the Default demo -> http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx.

Open the Document manager and upload some unsupported file which size does not exceed 200 kb. For example upload a small image file. You'll get the following error:

The size of the uploaded file exceeds max size allowed.
The extension of the uploaded file is not valid. Please, provide a valid file!

while only this line should be shown: The extension of the uploaded file is not valid. Please, provide a valid file!

Pressing ENTER over a list item not only creates a new li, but also inserts additional <br> element.

Video: https://www.screencast.com/t/PZcYTKEtY4v

Steps to reproduce:
1. Open in Chrome:
2. Switch to Html mode and insert the following content:
<ol>
    <li>123 456
    <ol>
        <li>abc</li>
    </ol>
    </li>
    <li>789</li>
</ol>

3. Switch to design mode
4. Put the cursor inside the first li (e.g. before 5) and press ENTER

Result: A <br> element is added in the beginning of the new <li> element

It should rather select the last cell of the table. 

1.       Visit the RadEditor demo at https://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx (I used Google Chrome.)

2.       In the HTML view, replace the entire demo text with

This <strong>strange</strong> thing

3.       In the Design view, place the cursor at the very end of the line, and press Shift+Left repeatedly.

a.       At first it will highlight the final letter correctly.

b.      Then it will UNHIGHLIGHT the final letter!

c.       Then it will begin highlight more letters again starting from the letter BEFORE the final letter.

d.      Then, after highlighting the “e” in strange, it will being UNHIGHLIGHTING starting from the righthand side of the selection!

e.      Then it will highlight left as far as the “s”.

f.        Then it will start UNHIGHLIGHTING from the right again!

g.       Then highlighting the space to the left

h.      Then UNHIGHLIGHTING the space to the left!

i.         Then highlighting to the left as far as the beginning of the line

j.        Then UNHIGHLIGHTING from the right side of the selection!

Pressing Shift+Left and Shift+Right should always modify only one end of the selection, and the other end should always remain where the selection was started. This is how Windows Notepad and virtually all other applications behave.

Steps to reproduce the text highlighting issue:

1. Go to https://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
2. Delete the content and write a single line
3. Use the mouse to highlight a portion of text starting at the end (right side) of the text and dragging toward the beginning (left side).
4. Stop about halfway to the beginning of the text.
5. Now, while the text is still highlighted, press shift and left arrow to continue selecting. This will work for some time until the highlight gets near the beginning, then, the highlight will start moving from the right side.

When using Table Wizard to insert a new table inside a table cell, the selected table is replaced by the one created from Table Wizard. 

Currently, the workaround is to use the plain InsertTable tool in order to nest tables. 

FileBrowser pager slider tooltips: "Increase", "Decrease"

FileBrowser grid column resize: "Drag to resize" 

When creating or updating old areas, the target value always shows either Target or the lastly selected one. It does not update its state.

Tracked content that is deleted should be removed directly, but newly added content should be tracked.

ContentEditable=true attribute is added to the body element of the Editor's content when resizing a table in RadEditor in Chrome.

http://screencast.com/t/0s3QlydHv

When there is a hidden <tfoot> element in the table, the Delete Row command in the editor context menu cannot delete the last row in IE. Works with other rows and other browsers.

WORKAROUND: use visibility: collapse for the footer rows instead of dispay:none for the footer

Repro steps:
- Use the markup attached below
- right click the last row in any table
- choose Row > Delete Row 

Expected: row is always deleted

Actual: in IE you cannot delete the last row of the second table

Below is my steps to find this issue:

1. Open the browser with IE 10 mode or genuine IE10.
2. Create a table with Editor.
3. Right click the table and then select table properties. Then click Table Layouts tab and select a style.
4. Click OK, the style can be kept this moment in Design tab.
5. Click HTML tab and find the CSS details are missing and click Design tab again, the style cannot be kept.
6. There is no reproduces with chrome or IE 11. 
7. I also test this case from your ow site https://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx


A video repro is also attached

The browser becomes not responding when pasting content with a lot of span elements in IE11 in RadEditor Design view.

You can reproduce it in the following demo: http://demos.telerik.com/aspnet-ajax/editor/examples/workingwithlargecontent/defaultcs.aspx

A JavaScript error is thrown when a hidden AccessibleRadEditor is loaded in IE 10. The error message is:

"SCRIPT5007: Unable to get property 'get_element' of undefined or null reference "

Code to reproduce the issue:

        <asp:Button ID="btn1" runat="server" Text="Show Editor" OnClientClick="showEditor(); return false" />
        <div id="div1" style="display: none">
            <telerik:AccessibleRadEditor ID="AccessibleRadEditor1" runat="server" ></telerik:AccessibleRadEditor>
        </div>
        <script>
            function showEditor() {
                $telerik.$("#div1").show();
            }
        </script>