I updated my Nvidia video drivers then went into Z3 to finish up a model of mine and then I tried to used subtool master, the menu pops up but then disappears right after, Whats going on with that ? now i cant use Subtool master at all I tired reinstalling it I might reinstall Z3 and then reinstall subtool master see if that works but man thats a pain in the butt.
If SubTool Master worked fine before and nothing has been done to change the contents of the ZBrush folder, then SubTool Master is continuing to work fine now. Reinstalling it or ZBrush won’t fix this issue.
Instead, there’s something else going on with the system itself. I don’t think the video drivers could cause this, though. Are you sure that’s all that has changed about your system?
I’d run a virus/malicious software scan before doing anything else.
works fine now i did nothing to change anything but it works now?
thank you for the responses 
i guess it was just being tempramental at the time or something anyways thanx again!
It’s possible you have a sticky keyboard. Pressing the spacebar, Enter or Esc key will close the SubTool Master pop-up menu.