User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.12) Gecko/20080201 Firefox/2.0.0.12 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b5pre) Gecko/2008032502 Thunderbird/3.0a1pre A subfolder specified in a command line sometimes fails to be selected, depending on the previous open/collapsed state of rows in the folder pane. Reproducible: Always Steps to Reproduce: 1. Select a subfolder in the folder pane (for example: Local Folders/Alpha/Beta) 2. Click the account twisty only, collapsing the account row. 2. Close Thunderbird. 3. Start Thunderbird from a command line, specifying the subfolder. For example: thunderbird -mail mailbox://nobody@Local%20Folders/Alpha/Beta Actual Results: The subfolder is not selected. Expected Results: The previous open/collapsed state of rows should not affect the command. In the example, this happens because EnsureFolderIndex toggles Alpha, even though Alpha is already open. With Alpha now collapsed, it cannot find Beta. http://lxr.mozilla.org/mailnews/source/mail/base/content/msgMail3PaneWindow.js#1609

this failed for me only when local folder *account* was collapsed. if you check the console you probably see ... Error: gMsgFolderSelected is undefined Source File: chrome://messenger/content/msgMail3PaneWindow.js Line: 225 Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b1pre) Gecko/20080928120750 Shredder/3.0b1pre