I like this app a lot but for some reason my x64 Win7 won't let me use the F12 key to set a window to be ignored.  I haven't remapped that key or anything.  I was using F11 in another program with it set to be used globally (seek ahead 10 secs on my media player), tried disabling that but Gridmove still won't let me use the F12 - I press it and nothing happens.  Hitting F11 does sucessfully cancel the operation.  Any thoughts?  This is about the only bug of any matter for me, too.  I've tried Window Manager too, man is that thing overkill.