Sega Genesis problems

[SchneiderCPC664]

After lauching the core the OSD shows files from the root level, but the menu doesn‘t work. On my first launch the OSD worked and I was able to play a game. What‘s happend?

[DanyPPC]

Have you re-launch the Core pushing the first button of MiST ?

[SchneiderCPC664]

Keyboard batteries low and non standard MIST OSD (no gamepad control) and I‘m lost... ops
Yes, a reset with the button solved this. Thanks for advice.