I encountered a similar problem (See attached screenshot). For me it occurred just after configuring my second monitor (which I configured using nvidia-settings) and without my xorg.conf saved, and I was getting some other funny effects as well (like windows opening on the border between my screens, toolbars spanning both screens, etc).
However, after fiddling with my settings and restarting X the problem seemed to go away. If you're still encountering this bug, it might be worth posting your xorg.conf and/or more information on your setup. ** Attachment added: "Screenshot showing menu opening off screen" http://launchpadlibrarian.net/14493733/firefox3beta5bug2.png -- Firefox shows menu on wrong screen or not at all. https://bugs.launchpad.net/bugs/229298 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
