After reading the (now closed) thread
http://duc.avid.com/showthread.php?t=392976
("Avid Cloud is a Joke")
I realize I am experiencing the exact same problems.
Projects disappearing, upload error, lost versions, can't open file, can't login.
Projects started to come back af 24 hours. However the latest edit of a song is gone. Especcially when using using grouped files with elastic audio edits Projects seems to have trouble to keep up with the uploading and end up in an upload error, ruining your latest version.
I am a happy PT user , suffering from an occasional bug , but on the whole it's a great product.
However, Cloud Collaboration, is total rubbish. It is simply not stable. A good idea but bad execution.
Avid charged me 89 euro for 30Gb of useless cloudspace. Complete waste of money.
Now I realize why you to have agree with the non-refund option.