The latest version is giving me duplicate comment errors and stopping posts at the comments section. The messages read: "Duplicate comment detected; it looks as though you’ve already said that!"
When I look at the source code, I also get a message which reads: "Ticket #11289, IE bug fix:"
Something in the code is now erroneously triggering WordPress's default duplicate comment message. I am going to roll back and see if the same problem is replicated in previous versions.