http://dev.fckeditor.net/ticket/3429
http://dev.fckeditor.net/ticket/3181
'nodeName' is null or not an object fckeditorcode_ie.js, line 33 character 6143
--> if (e.nodeName.IEquals('input')&&e.type.IEquals(['radio','checkbox'])&&!e.disabled) basic html tags

Re: Javascript error in ie8
i think that they have to open the case again.
thanks