Hello, I just rebuild my PI3 from scratch and all went back to normal.
I guess my kids messed the config.
In order to avoid that to happen again, I activated the parameter :
system.es.menu=none

Thanks for the support.

Do you know how to disply the MAME menu in order to check the key mapping.
I can only manage to open the libretro menu but can't manage to access MAME menu itself.

yes any MAME games give me the same result (annoying menu).
Yes this is the SNES button names. the PS3 equivalent are X Cross and Square.
Do you have the same issue (using last 4.0 official release with default MAME 2003 0.78 version) ?

Not editing a file but I could have reached the MAME menu and tune the joystick config by mistake by changing ~ to B+Y but even that I doubt I could have done that without remembering.
If noone can reproduce my issue and there are no easy way to clean any specific config I could have done by mistake, I wil probably reinstall everything from scratch but I fear to get the same result.

When playing MAME games if I ever press B and Y button together (could happened is many games where Y is used for jump and B for shoot), I can see in the bottom of the screen a mame menu where I can change the volume. As soon as the menu appear, when going right, the volume increase and left it decrease. Going up and down change the menu entry that is beeing configure to gamme or brigthness.... All that while I am still trying to play. The only way to remove it is too press again B + Y (still while playing...)
Anyone reproduce the issue ?
It only happen with player 1 controller (I use PS3 controller). pressing the same 3 keys on player 3 controller has no issue.
Maybe I messed up the map key in MAME config by mistake so is there a way to clean any specif config I could have change ?

Thanks.