Hi, I don’t know if this has been reported or not, but MAME_Libretro_dll version for Windows 32bits is not working. Crashes retroarch and in the log window only appears “This application has requested the Runtime to terminate it in an unusual way”.
It can be a problem only with that particular build, because x64 (64 bits) works fine. Also the version for Android works fine.
I can confirm the issue with 1.5.0 and at least since 1.4.1
If this has been reported before, sorry for the inconvenience.