Right-click on a mail in the list and get the contextmenu:
When moving the cursor downward over the menu to reach the item wanted, all goes well until reaching the item Move Message To … Then the menu vanishes (as if one clicked outside it)
See this on two different systems (with two different users).
More people having this?
Edit: One can move the cursor outside the menu to the bottom. From there the last item can be reached, but going upwards to Copy Message to … lets it vanish. Thus it seems to be restricted to those two items.
