@azo There is a trick, if you know how to edit a file under linux (with WinSCP for example). In SSH type mount, -o remount, rw /
Then edit /etc/init.d/S26recalboxsystem
and replace rb_xarcade2jstick& # 0.1
by ( sleep 8 ; rb_xarcade2jstick ) & # 0.1
. Reboot, and it should work (at least that's the fix that wil be in the stable 4.1)