I am currentally running version 2.3 on a B+ and everything is almost perfect.
The only remaining issue I have is that I can not exit Genesis/MegaDrive games with the select+start buttons like I can in NES and SNES. From looking around I have gathered that the RetoArch.cfg button layouts do not apply to this emulator because it uses DGEN which is seperate. However I am unsure as to how I go about either editing just the DGEN controls or getting DGEN to recognise the RetroArch.cfg button mapping.
Can anyone point me in the right direction to solve this? I am using the SNES Buffalo USB Controllers if this helps.
The other issue I have is when I load up Playstation games my screen resolution changes and the picture goes out of bounds.
I tried the above video and I was stuck with the same issue. I have since moved to Version 2.4.2 and am not encountering the problem anymore. I would guess that I messed something up along the way in my 2.3 install and have had a better (more experianced) install on 2.4.2.