Hi Peps,
If you're sure it's not a license issue (did you revert popups to default?) as here...
http://www.gnutellaforums.com/showth...176#post154176

...then just make sure your maximum downloads aren't set at zero. Tools > options > downloads.

Otherwise, try deleting your preferences folder. Instructions here
http://www.gnutellaforums.com/showth...threadid=36420