I use Cursor FX Plus on Windows 8.1 with no problems, even on the metro screen.
Actually, the ONLY problem I have with CursorFX is that when using on a touchscreen PC, once I touch the screen, the cursor reverts to the default OS cursor. I have to press CTRL/Shift/C twice to get it back, only to lose it again next time I touch the screen.
As long as I use a mouse, no problems at all.