I've set up Mail to check my Gmail accounts, using IMAP. I've done the "Use This Mailbox For" settings as directed and everything works for most of the accounts. However, on one account, I see that there are received messages showing up in the trash for that account, when they weren't deleted (no mail filters set up). The messages also appear in my inbox. I want to re-assign the folders on that account, but on each of the folders (Inbox, Drafts, Sent, Trash, Junk) the "Use This Mailbox For" choices are now grayed out, so they can't be changed. Does anyone know how to reset this so I can make sure I didn't accidentally assign Inbox > "Use This Mailbox For" > Trash?