Spellchecker.net keeps loading...

I tried disabeling the spellchecker in the config file with:

config.disableNativeSpellChecker   = true;

But when I open a page that contains CKEditor, svc.spellchecker.net keeps loading accordion to the status bar in the browser (FireFox 3). Why is this and can this be disabled?

FireBug also reports 16 JS errors:
UnnamedClass.toString
uncaught exception: unknown (can't convert to string)