By "top-menu" I mean the menubar that usually is placed right below the top window border. The "File, Edit, .... Help" bar.
I'm running the latest E17 packages from Gentoo, on a fully updated and stable Gentoo system (no ~keyword packages, other than E17 packages).
Sometimes when i rightclick in a GTK application or click on a menu in the top-menu-bar, for instance in Firefox, the dropdown menu doesnt get shown. I have to restart Firefox for it to reappear.
The same happens in Eclipse, but in Eclipse I can get the dropdown menus to appear if I click the close "X" button on the top-right windowborder. After Eclipse shows the "Do you wish to exit?" dialog, the dropdown menu i wanted gets shown.
I dont know how to produce it. Sometimes it doesnt happen all day, but today it has so far happened 2 times. I will try running Enlightenment without composition enabled and see if it helps.