My screenshots were working for a while, but today when i am entering like 30 new sites i just get black screens. Is there a limit to enter or is there something going on on your server?
Do you have the files owned by your Apache owner? On my systems this is www-data. Go to your install directory and do this:
chown -R www-data:www-data *
both of the people who signed up get a long screen of garbage when generating screenshot and not a valid screenshot. Can I give you access to track this down?