Comment 6 for bug 785195

I have the same problem, that the context menu disappears as soon as I move the cursor.

I can also confirm that like guyomel above, if I open and close the preferences menu the problem is temporarily fixed. I expect there are other actions that will also "fix" the issue but I have not yet worked out what they are.

At this point I haven't worked out what actually induces the bug, so it's hard to do more testing.