That's odd, if it doesn't even show any errors then I have no idea what's going on. Maybe Windows put the FileBot window outside of the screen bounds? If the window is just off-screen, then simple Windows shortcuts like
Win+Left might help you center the window back on the visible screen.
Settings reset might help. Just run this command once:
Have a look at this thread:
viewtopic.php?f=10&t=2741