Your website is very slow and it seems FCKeditor doesn't expect that some of its components take this long to load and triggers a bug in FCKeditor. For example, fckeditorcode_ie.js loads in 1.7 seconds, while all of the editor files load in about 25 seconds.
Once editor files are cached by IE, it works fine. Try turning on compression in IIS and see if it helps to improve speed.
Hopefully somebody from the FCK team will look into this. This bug is 100% reproducible - just make sure to clear the cache.
Re: Unspecified Error FCKEditor
Once editor files are cached by IE, it works fine. Try turning on compression in IIS and see if it helps to improve speed.
Hopefully somebody from the FCK team will look into this. This bug is 100% reproducible - just make sure to clear the cache.