I've never heard of these bugs. I think RPG Maker just doesn't like Haste.
Ginger, that's a very rare bug that can happen in any RPG Maker game. This is the first time it's happened to any of my games, though. It's just really rare. I can see if I have a save file I can send you that might be close to where you were.
G4brial, I'm not sure why it does that. It just goes black, and that's it?