IE9/IE11 Enter_BR cursor doesn't go to the next line

[Jennifer]

Related to a closed ticket, ​http://dev.ckeditor.com/ticket/7433, but the behavior occurs when enter key is pressed, not shift+enter.

In ENTER_BR mode, when the user presses the Enter Key at the end of the line, the cursor doesn't go to the next. Instead, the cursor behaves as if the Space key is pressed. The cursor only moves at the next line when the user continues to type after the Enter key.

This issue is intermittent, but it occurs more often if there's a postback that occurs in the page.

Steps to reproduce

1. Get the 4.5.6 standard version of ckeditor
2. In config.js add line: config.enterMode = CKEDITOR.ENTER_BR
3. In the page with the ckeditor loaded, cause a postback (I did so by pressing the Enter while having focus on a button)
4. Tab over (not mouse click) to the ckeditor and type something and press Enter.

Expected result

The cursor goes to the next line.

Actual result

The cursor stays on the same line

Other details (IE9, IE11, CKEditor version 4.5.6, ASP.NET)

[Jakub Ś]

I could not reproduce this issue. Could you provide reduced sample file/application showing this problem?