Nestopia wont start up or even have the menu available.

My Nestopia doesn't have the droplist menu on top anymore and the bottom has that weird white space. The emulator was fine when I used it this morning, but it started doing this when I turned it on at the afternoon.

What can I do to fix this problem? I already have tried to download a fresh copy of it from this website, but it still doesn't work.

Did you installed any theme for window? If so, please revert back to normal.