I loaded Galaga and Gauntlet in MAMEUI32. What I noticed is that the fire button in Galaga (Player1 Switch1) doesn't seem to register. Player1 Coin and Player1 Start work fine. I loaded Gauntlet so I could check the Player2 Buttons. What I found is that the Player2 Down seems to run both the down movement of Player2 but also the Player1 Switch1 Fire button. Checked the wires and all seem to be connected properly. Has anyone ever seen anything like this before?
Since only some games are messed up, launch a game that is acting up and press tab to bring up menu, go to "Input (this Game)", and check that the problematic inputs are properly assigned.
If not:
1. Highlight the wrongly assigned input.
2. Press enter, press escape. (clears inputs)
3. Then press enter, press the desired button/key (to assign the key) or escape. (restores MAME defaults for that input)
4. Repeat steps 1-3 as needed.
Scott