Warning when creating profile with TinyMCE (or FCKeditor)

Hi,
I have just installed Wysiwyg with TinyMCE 3.2.1. When I try to create a profile (after setting permissions for authenticated users to access wysiwyg editor and disable html filter and line break converter at the input format settings page) I get the following message and no buttons show up in my editor.

warning: Invalid argument supplied for foreach() in /sites/all/modules/wysiwyg/wysiwyg.admin.inc on line 363.
warning: array_filter() [function.array-filter]: The first argument should be an array in /sites/all/modules/wysiwyg/wysiwyg.admin.inc on line 368.

I got the same message when trying to use Wysiwyg + FCKeditor. Then all buttons showed up and most of them seemed to work fine, but I had another problem – the link button tried opening fckeditor/fckdialog.html when the actual file is in fckeditor/editor/fckdialog.html.

Does anybody know what causes the warnings? Does anybody know how to fix the link problem with FCKeditor?

Thanks, Sofia