Blank mails problem in thunderbird

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http://askubuntu.com – I have configure gmail IMAP account in thunderbird (10.0.2) on UBUNTU 11.04. All things was working fine, one day i found blank mails in my local sub folder which have filter to download mail from IMAP indox to local inbox. No subject no body no person name, nothing just a size i have that only 0.1k. And sometime when i try to drag and drop mails from IMAP to local, this happen without any notification. i move these mails from IMAP to local folder that means i never find these mail in IMAP account. So i just lost my mail. My Question is that why this happened, i dont want this will happen wi (HowTos)