Shader Forge window frozen

The main window/tab for shader forge is frozen and won't close/move.  I can resize the window, but it won't minimize or close.  When I try to run shader forge again is just appears blank.  It also kills the frame rate when playing a level.  I'll close unity and reopen and the window comes back as blank again.  is there anyway to kill the window and start fresh? Or can I remove the shader forge stuff without messing up current materials I've used shader forge for?