I have a raspberry pi 2, memory split to 384, overclock set to pi2. (also tried without overclock, same result)
everything runs fine with all emulators, but when I try to use lr-imame4all after loading the rom I only see a white screen. nothing else works, but the exit hotkey and back to emulation station.
same happens with lr-mame2003.
lr-fba-next which I use for neogeo works fine, though.