Sign Out When Sign In http://forums.adobe.com/thread/1450581?tstart=0 may help
And, just in case you ever have this problem...
BLANK Cloud Screen http://forums.adobe.com/message/5484303 may help
-and step by step http://forums.adobe.com/thread/1440508?tstart=0
Also, this is an open forum, not a direct line to Adobe support... please do not post personal information that may be harvested by a "spam bot"