strange issue with imap and a blank empty sent messages folder

So here is a weird one. I got a new computer last week, Mac mini core duo. Set everything up, synced my .Mac and it set up mail. I have been using mail, i try to view Sent Messages for one of my IMAP accounts which should have 10,200 messsages in it. I see nothing. On rebuild mailbox it goes blank. Some messages I send are stored until i rebuild mailbox and it again is empty. On my other Macs (powerbook 12" and dual G4) I am still able to view and manipulate this same accounts Sent Messages. One webmail everything still works as well. While trying to copy old messages down to the Powerbook to archive them I noticed that it was very slow, and messages which were not cached already caused the Copy to fail. I am using Courier IMAP with Maildirs and Postfix on FreeBSD as a server.