I think I should send the jars to you before the release for QA :)
Well, there are no schema changes. I only added generating revision on collection change and you're getting an exception from that (CollectionChangeWorkUnit in the stack trace). So it's most probably a bug.
The only problem remaining is reproducing it :). Do you know where it happens? What commit mode in hibernate are you using?
What will probably help temporarily, is to switch off generating revision for collections, by setting