User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; it; rv:1.8) Gecko/20051111 Firefox/1.5 Build Identifier: Thunderbird version 1.5 (20051025) If I'm using Thunderbird, reading a message in its stand-alone message window (which is currently in the foreground), and I switch to a different application with Command-Tab, and then switch back to TB, the message window has gone in the background and is not visible anymore; I have to bring it to the foreground again by using Command-<. Reproducible: Always Steps to Reproduce: 1. Open Thunderbird, resize its main window to almost full screen, and then open a message in a new window (e.g. by double-clicking on its header line). 2. Switch to a different application (e.g. Firefox, which was already opened before) with Command-Tab. 3. Switch back to Thunderbird with Command-Tab. Actual Results: The main TB window is visible, but the message window is not. Expected Results: You should see the message window above the main window.

Seeing this too --> Confirming.

The bug appears to be fixed in Thunderbird 2.0.0.0 on MacOS X 10.4.9.

WFM on trunk, too.