I thought I would start this thread for those of us who have installed pro-sites-3.0-RC-1.zip
I un-installed all supporter file from mu-plugins folder. I uploaded all files in zip file to plugins folder via ftp and network activated. I also reactivated Supporter Advertising.
I got warning page with message "You must install the Supporter Ads module of the Supporter plugin before activating."
Now I can't even view my main site or change to any other screen in wp-admin without getting this page with message. Help!