I am using Liferay 4.2 on both windows and linux.
When I connect remotely to the server, I could not see FCKEditor box in Journal Content portlet and so the content management is impossible.
This is the error I could fetch in Firefox JavaScript Console:

"Error: uncaught exception: Permission denied to get property Location.search".
the property name may vary.
No difference when I use other liferay wysiwyg editors...

the error raises erratically, but after a while I will have it permanently.
I would be thankful if anyone could help me...