My fckeditor below:
Then try to click the radiobutton
You will see the whole window being 'frozen', it will not react on clicking anymore.
Even the tabs in IE won't respond anymore.
The only way to get out of this situation is selecting another window.
This only happens in IE (tested in IE7), not in Firefox.
Happens in fckeditor 2.5 and 2.5.1, not in 2.4.3.