A few minor bugs I've encountered:
- Nestopia starts with its window behind mGalaxy--or possibly no window at all? I do hear sound from the emulator, but I can only see mGalaxy. Nestopia works fine outside of mGalaxy. I ended up switching to FCEUX so it's not really an issue for me.
- FCEUX can be slow to load and slow to quit (5-10 seconds) but it does work. This may be an issue with the emulator itself, though--loading from command line appears to be just as slow, though quitting is instant when not run from mGalaxy. This is version 2.2.2 which I believe is latest.
- mGalaxy Runway appears to be case-sensitive to file extensions when creating a database from a ROM folder. I just renamed my ROMs to have lowercase extensions, but still it'd be nice if both worked.
My system is running Windows 8.1 Enterprise, 64-bit.