Mail uses 100% CPU, then says there are 0 messages in mailboxes

Hi all,
I just decided to switch from thunderbird back to mail for various reasons. So I imported all my t-bird mail boxes successfully by copying the mailboxes and adding the .mbox extension, as suggested by someone somewhere on the internet. Mail says I have alot of mesages in some of the mailboxes, it says 14,000 in one, but I I don't think thats right.
At any rate, here's the problem: When I click on a mailbox I get an icon next to the mailbox that looks like a pie chart, initially messages in the mailbox will be displayed. If I click on another mailbox, eventually (after a mailbox or 2) I get the pie icon next to that mailbox and no messages displayed, and the title bar of the mail window now reads *name of mailbox* 0 messages, now if I click back on any other mailboxes I get the pie and no messages displayed and the 0 messages title bar, if I click on my inbox the title bar says also says 0 messages, 11 (or whatever) unread.
If I quit mail mds and mdimport are going crazy for a little while probably trying to index the messages. If I then reopen mail it displays as it should for a few clicks then I start getting the pies and no messages displayed.
Note mail is maxing out the available CPU cycles through this entire process.
So I guess I don't really know what the deal is. Do any of you? Like, Will mail sort itself out eventually? Do I need to re-import? Can mail even deal with the amount of email messages I have? Can I turn of spotlight indexing in certain mailboxes?
I thought I liked the idea of spotlight integration but maybe I don't...
TIA,
Jonathan
Message was edited by: Jonathan Sylvan

I'm having exactly the same problem with Mail 2.1.1 (build 752.3).
I'm experiencing this since I configured a Gmail account and read the messages in a Smart Mailbox.
There are 3 rules:
All messages where one of the destinations is <my email>
All messages where the origin is <my email>
All messages in malbox <my Gmail inbox>
Include replies: checked
I'm able to use (send/receive) this smart mailbox for several hours without any problem, then when I send a message (random length, no particular difference with the other sent messages), Mail complains about my reply (that I'm supposed to see in my smart mailbox) not being on the server (?), and all mailboxes (including trashed, spam, smart and non smart) are displaying "0 messages".
I'm still able to receive mail, and the unread counter grows as I receive them, but I'm not able to see any message in the box.

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