DisplayFusion 10.0b12 introduced a new bug with the first click of the tray hidden 'up arrow' to show the hidden tray icons. The window is shifted to the top screen (looks like the offset horizontally for the padding that I use).
Bug introduced with b12 and exists through b15.
The bug is only present with the first click of a fresh boot/login.
Subsequent clicks render properly.

bug present with b16
bug present with taskbar hooking disabled