I had problems with FG-X in X2 - now I'm back on X1 (awaiting the bug fix patch!!!!!) no problems at all.
There is some issue with X2 (on my specific set up) that causes strange graphical problems which are almost impossible to recreate and things like this slate problem.
They all disappear when I use X1 (same machine, same set up) so they MUST be something to do with X2 - that's why I've stopped using it.