On a vaguely related minor note, I've noticed that after submitting Modified Items from a user sandbox, the Submission Info name and description columns are the wrong way around when looking at the Recent Snapshots panel.
I'm using Community 2.1 RC1 btw, so apologies for mentioning this if it's been fixed in the latest version. Not got around to upgrading yet. ops:
Last Tuesday, the following fixes were checked into the 2.1.0 Enterprise codeline (v2.1 branch). These fixes are currently available in the 2.1.0 Enterprise BETA (available to all customers on subscription or Community-members on a trial basis). These fixes will be rolled into an updated Community release after the release of 2.1.0 Enterprise (end of month).
In the 2.1.0 Enterprise codeline, there have also been a significant number of tweaks to resolve locking bugs and performance issues, particularly related to submit. These latter changes have been substantial. Both sets will roll into an updated Community release, but if you need these changes today, I recommend getting access to the 2.1.0 Enterprise BETA.