Hi Bonnie,
I might need the email address of the secondary account you mention to fully understand the issue. Most of the recent server error reports that I've seen have turned out to be related to insufficient space on a related account. It appeared in your case that you may have been attempting to share all of your files (via a shared folder/collaboration) from a paid account with 20GB of storage to a free level account which has 2GB of storage. Once the free level account maxed out its storage use, it will prevent you from being able to sync the files within the shared folder on the paid account too and result in server errors. I think this is what was happening but would need the secondary account info to confirm.
If you want to send me a message with the secondary Adobe ID I can check. You can click on my name to for the option to send me a private message here in the forums.
Thanks,
- Dave