Forwarded Gmail Message not Deleting

Got a 9930, and for some reason when I forward an e-mail to my wife's Gmail address, it forwards the message, and then doesn't let me delete the forwarded message. I have to delete my Gmail acct from my BB, then re-set it up. I've got the messages set to combine similar subjects, but this has never happened before with my old BB. Has anyone had this issue come up? Any solution?

*EDIT* I switched from grouping messages by subject back to individual messages, and that seems to have cleared up the issue for now, however it would be nice to go back to grouping all messages by subject. Has anyone had this same issue?