Sorry for all the annoying posts, but there is another ROM which is acting strange.
Karate Champ (U) (REV0) [!].nes
You'll just get a blank screen when you run this ROM. It works in Nintendulator and FCE Ultra, though.
This ROM is also discussed a bit here
. It may be a bad dump. Any idea why it works in Nintendulator? How does it run on the real NES?