Nebula Questions - Can't get games to play

I'm trying to setup Nebula v2.25b and had some questions.

- Are all these games in v2.25b in Mame and running fast in Mame? Is there any advantage to using Nebula versus Mame? I used to play this a lot for the Metal Slug games when I had Mala setup.

- When I launch a game from GameEx it looks like it launches but then it comes back to GameEx right away. Nebula runs fine standalone.

- I tried using the rom path for Mame and I've tried also from Nebula's rom folder but the games don't play. Should this make a difference?

Gameex.ini and log.ini are attached


Thanks