Using plain RadEditor controls with default Default toolbar where ToolProvideID is also used, a JS error is thrown and ToolProvide mechanism does not operate as expected. 

As a temporary workaround, you can use any other toolbar mode (e.g., ShowOnFocus).

The RadWindow used to hold the toolbar does not have a proper width set and the toolbar's layout is unusable.
Possible workarounds:
- avoid setting the Width property of the editor in percent
- set the ToolsWidth property to the desired static value
- use the following script to calculate the current dimensions each time the toolbar shows up:
function OnClientLoad(sender, args) {
	var toolPopup = sender.get_toolAdapter().get_window();
	toolPopup.__editor = sender;
	toolPopup.add_show(resizeToolWindow);
}

function resizeToolWindow(sender, args) {
	if (sender.__editor) {
		var editorDims = $telerik.getBounds(sender.__editor.get_element());
		sender.set_width(editorDims.width);
		var currDims = sender.getWindowBounds();
		sender.moveTo(editorDims.x, editorDims.y - currDims.height - 10);
	}
}

where the OnClientLoad function is attached to the OnClientLoad event of the editor


Leave your comment on the desired behavior - whether the toolbar should have a static width (i.e., the initial width with which the editor renders, as is the current behavior with the ShowOnFocus ToolbarMode), or whether it should update its width according to the editor width when it shows up (as the script above does).

Running the Word formatting tool on a plain HTML text with underline decoration, strips the style formatting.

This tool should only affect the specific MS Word markup fetched from pasting. 

When the content is mixed up by text written by multiple users on deleting text, which is not written from the current user is removed, without accepting the changes.

When the user select an inserted through the ImageManager image from the Editor's content, its size in the properties tab of the ImageManager always displays its original width and height.


Steps to reproduce:
1. Add an image to the editor and set it's width and height.
2. Select the image and click in the toolbar on the ImageManager
3. Click on the Properties tab

Result: The width and height are set back to the initial ones.

The Edit Content and other toolbar buttons are untouchable on Android Chrome on Galaxy S7, S8 and Note 5.

It is very hard to switch to edit mode and so on.
http://demos.telerik.com/aspnet-ajax/editor/examples/mobile-and-touch-support/adaptive-behavior/defaultcs.aspx

Several JS errors are trown when writing in re-focussed empty Editor in Chrome.

Video:  https://www.screencast.com/t/Wx6Ucs8m6S5w

First error's message:
RadEditor.js:10521 Uncaught TypeError: Cannot read property 'startContainer' of null


Steps to reproduce:
1. Open in Chrome: http://demos.telerik.com/aspnet-ajax/editor/examples/trackchanges/defaultcs.aspx
2. Switch to HTML mode and clear the whole content
3. Switch back to Design mode
4. Click any of the Bold/Italic/Underline commands
5. Click out of the Editor's element
6. Click back in the Editor's content area and start typing

Result: JS errors are thrown

Workaround is to add the following function override at the end of the page (a sample is attached below)
				Telerik.Web.UI.Editor.Utils.isWindowDestroyed = function (window) {
					var doc;
					try{
						doc = window.document;
					} catch (e) {
						return true;
					}
					if(Telerik.Web.Browser.safari && !doc){
						return true;
					}
					return !doc.defaultView && !doc.parentWindow;
				}

There is a bug in the editor when using the image manager to insert an image after creating a new image.  This is recreated on the live demo site - http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx

1. Open the image manager in the editor.
2. Click on an image editor after selecting an image.
3. Use the resizing tool to resize and save a new version of the image. 
4. Once the save is made, both images (the original and the newly created) are selected and when you click insert, both images will be inserted.

Deleting the fisrt char of a list item removes the li element instead of the char (using Delete button). 

The issue is introduced in Q1 2016.


Steps to reproduce:
1. Open http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
2. Insert the following content in html mode:
 <ol>
    <li>123</li>
    <li>456</li>
</ol>

3. Switch to Design mode and click in the begining of the second list item (befor 4).
4. Press the Delete key

Result:
<ol>
    <li>123456</li>
</ol>

Expected
 <ol>
    <li>123</li>
    <li>56</li>
</ol>

Occurs in IE11, IE10, or IE9 (Works in IE8).
Copy a table from MS word/excel into editor.
Right-click right most column.
Select Column > Delete Column.
Unable to select other rows in copied table or edit table cells

Steps to reproduce:
1. go to demo url http://demos.telerik.com/aspnet-ajax/editor/examples/edittemplate/defaultcs.aspx
2. click add new record
3. try to manually resize editor. it won't.
4. click add new record again.
5  try to manually resize editor, now it will.

The following concerns the editing of tables within RadEditor using the out-of-the-box Delete Row and Delete Column commands:
Delete Rows:
- Click in a cell.
- Click the Delete Row button. The row is deleted.
- The Delete Row button is still enabled, but when I click it nothing happens. The cursor is in the expected location and I'm able to immediately begin typing. However, I must again click in the cell for the Delete Row button to work.

Delete Columns:
- Click in a cell.
- Click the Delete Column button. The column is deleted.
- The Delete Column button is disabled. If I begin typing or click in the table it becomes enabled and functional again.

The end-user should be able to repeatedly click either button and have it work until there aren't any more rows or columns left to delete.

The following code will trigger the issue:
<ins author="Test user1" command="Insert" timestamp="1488935783059" title="Inserted by Test user1 on 3/7/2017, 5:16:23 PM" class="reU7">
<p cssproperty="verticalAlign" author="Test User2" timestamp="1488945891760" title="Formatted by Test User2 on 3/7/2017, 8:04:51 PM" class="reFormat reU0" command="Remove alignment"><span style="font-size: 12pt;">&nbsp;</span><span style="font-size: 12pt; font-family: 'Times New Roman';">This is some sample text.</span></p>
</ins>
When track changes are enabled and you try to delete from the end of this text, the deleted characters move to the following lines with a strikethrough rather than just deleting.

You can create a list item, but it is impossible to type text in the list item.

Toolbar icons are missing in Image Manager dialog when custom content provider is used
https://www.screencast.com/t/VQyEb8tn

The Properties tab in Image Manager dialog Preview tab appear as blank when custom content provider is used.

http://demos.telerik.com/aspnet-ajax/editor/examples/trackchanges/defaultcs.aspx

Use the following markup:

<p><ins author="RadEditorUser" command="Insert" timestamp="1461912623680" title="Inserted by RadEditorUser on 4/29/2016, 9:50:23 AM" class="reU0">Apple</ins></p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p><ins author="RadEditorUser" command="Insert" timestamp="1461912654319" title="Inserted by RadEditorUser on 4/29/2016, 9:50:54 AM" class="reU0">Banana</ins></p>

Place the cursor in front of Banana

Press backspace

Expected: The empty paragraph is deleted OR the empty paragraph deletion is tracked (leave the preferred behavior in the comments)

Actual: The last letter of the first paragraph is deleted

IE8 and 9 freeze when trying to do a ReplaceAll in HTML mode and the string to find is very short - easiest way to reproduce is using a single letter.