I am on 12.04 64bit, on 3 monitors, 12.3 fglrx drivers and use Libreoffice 3.5.3 (Ubuntu repositories). The menus of Libreoffice seem to open on the wrong screen. It seems this is an old bug, but i have only noticed it when ubuntu updated Libreoffice to 3.5.3. Previously everything was OK. Every other application on my system behaves OK.
This issues has been reported in bugzilla http://listarchives.libreoffice.org/global/users/msg18576.html and launchpad https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/974900
Does anyone knows if there is a workaround? This bug prevents me from using LibreOffice.
There is one workaround is to uninstal “libreoffice-gtk” (http://askubuntu.com/a/140152/26508) but LO returns to the old menus.