More details might be helpful.
- Which ROMs reset?
- Build and version of MAME? (i.e. GroovyMAME v0.189)
- Front End?
- Support programs? (i.e. Joy2key, MAMEHooker, etc.)
- Operating System?
- Encoder?
- What key is assigned to Reset Game? (usually F3)
- Is that key programmed into the encoder?
- Is a keyboard plugged into the system?
Scott