Confirmed:
Peppermint Linux 3 (Ubuntu 12.04 LTS build) x86_64.
nvidia-current-updates driver stack.
Navigating menu from the top is the only way to access the upper entries when the right-click menu is spawned which requires moving the cursor off of the widget, around it, and down from the top.
Is this still happening with a current client? We've fixed some menu bugs.
Now it's working fine for me
Thank you for checking.
Nothing extracted yet.
System is
Debian sid 64
KDE
304.64-2 Nvidia drivers
To test just open the "Friends" app, open the drop down menu on any friend and go down until the "Invite to trade" item. At this point, the menu closes itself.