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Hello, sorry to hear you ran into trouble. If there's a problem between Formulize and FCK, this is the first we've heard of it. I don't know enough about how FCK is setup to suggest were to look. I don't understand why the editor in use in other modules would be screwed up by Formulize, which makes zero use of the editor. I guess it could be related to the functions in the formulize/include/functions.php file which are loaded when the Form Menu is loaded. You could look in there for conflicts with functions used by FCK.
Or, you could turn off the Form Menu and see if that fixes the problem.
Without FTP access to the site and code, there's not much more I can suggest.
--Julian