Steps: 1. download a partial message (give a size limit in Account manager) 2. select the stub message 3. click "Download the rest of the message" 4. the rest of the message is downloaded fine, however: Result: No message is selected (not the original one, none). The msg preview pane is empty Expected result: The message (now complete) should be shown. I think this worked in previous versions of TB. Debugging: I get this in the error console after the click: Error: NS_ERROR_INVALID_POINTER: Component returned failure code: 0x80004003 (NS_ERROR_INVALID_POINTER) [nsIMessenger.msgHdrFromURI] Source file: chrome://messenger/content/mailWindow.js Line: 448 Linux console output: ACE: aUri=mailbox-message://aceman@...server.../Inbox#3692520 Begin mail message delivery. GetDiskSpaceAvailable returned: 14667599872 bytes Incorporate message begin: uidl string: 201204221701587058 Incorporate message complete. End mail message delivery. ++DOCSHELL 0xac78b800 == 14 [id = 15] ++DOMWINDOW == 30 (0xac7a5248) [serial = 39] [outer = (nil)] ++DOMWINDOW == 31 (0xac7a5408) [serial = 40] [outer = 0xac7a5200] Abort mail message delivery. ###!!! ASSERTION: no channel: 'm_request', file /var/SSD/TB-hg/mailnews/base/util/nsMsgProtocol.cpp, line 819 ACE: aUri=mailbox-message://aceman@...server.../Inbox#0 WARNING: NS_ENSURE_SUCCESS(rv, rv) failed with result 0x80004003: file /var/SSD/TB-hg/mailnews/local/src/nsMailboxService.cpp, line 698 JavaScript error: chrome://messenger/content/mailWindow.js, line 448: NS_ERROR_INVALID_POINTER: Component returned failure code: 0x80004003 (NS_ERROR_INVALID_POINTER) [nsIMessenger.msgHdrFromURI] The lines prefixed with "ACE:" were added by me into nsMessenger::MsgHdrFromURI and show the value of the aUri argument to it. It is strange that before the download aUri contains some msg #, but after download the # is 0. Maybe that is the problem.

Fixed by bug 748865.