I can confirm this bug.
This only happens with thunderbird, and when I call the old firefox2.
The effect is that on my laptop (Asus A8JS) the thunderbird window is shown on
the left display (I have a monitor attached right of the laptop, so left is the
laptop screen) in fullscreen, with no bord
The logs you requested from Simon:
My .xsession-errors
** Attachment added: ".xsession-errors"
http://launchpadlibrarian.net/16058556/.xsession-errors
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Thunderbird has no window decorations
https://bugs.launchpad.net/bugs/209848
You received this bug notification because you are a member
** Attachment added: "Xorg.0.log"
http://launchpadlibrarian.net/16059930/Xorg.0.log
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Thunderbird has no window decorations
https://bugs.launchpad.net/bugs/209848
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Bugs, which is subscribed to Ubuntu.
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ubuntu-bugs maili
** Attachment added: "lspci-vvnn"
http://launchpadlibrarian.net/16062394/lspci-vvnn
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Thunderbird has no window decorations
https://bugs.launchpad.net/bugs/209848
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Since about two months now, this didn't occur to me anymore.
Although I am not 100% sure I think it still occurred a few times after
updating to Ubuntu 8.10 (intrepid), but was gone soon after.
I think, for me, it's safe to say that this was fixed in the meantime.
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Thunderbird has no window d