Some applications exhibit strange behavior on latest Ubuntu Maverick. They show no menus. Applications I have discovered are Filezilla, Audacity, Codeblocks and Adobe Acrobat Reader 9.x when user has more than two pdfs open. This usually happens when user tries to install Canonical Unity thing, and because it is very unstable when installed from Maverick repositories, troubles follow along with its installation. Fix you ask? Here it is...
You must remove appmenu-gtk package. I haven't discovered any loss of functionality doing so. Appmenu thing will probably be used in next Ubuntu version for global menu thing in Unity enviroment. For Ubuntu 10.10 i see no reason for leaving in on your system except if you don't like menu bar in your apps. Just put this in your terminal and be on your way:
sudo apt-get remove appmenu-gtk
If you have any problems with this quick fix you can leave anonymous comment by clicking on the "comments" link in the upper right corner of this article.