Google released their own browser yesterday, and I noticed FCKeditor wasn't compatible yet (the most recent beta is, but the one used in FormHandler isn't, at least for the site I'm working on at the moment, which uses an old version of FormHandler anyway).
The reason is not because FCKeditor is incompatible with Google Chrome, but because FCKeditor sniffs the user agent, and doesn't recognize Google Chrome.
A quick fix:
In FH3/includes/fckeditor.php, FH3/FHTML/FCKeditor/fckeditor_php4.php and FH3/FHTML/FCKeditor/fckeditor_php5.php there exists a function called IsCompatible(). Find it and change these lines: