What did "nothing..." mean?

I think you may not quite get what qwerty12 was saying...

Included in Qole's Debian chroot package is a tweak that makes all dialogs draggable; it helps a lot with some apps. An unpleasant side-effect is that they always show up in the top-left corner...

And it only takes effect next time the tablet's restarted, which is why you only saw it after rebooting with the new kernel.