OK then, here´s v20 (on the first post).

The GB core is now up to date with CVS, which supposedly fixes the echo RAM bug and looks like it fixes several other bugs and timing issues. It broke the savestates pretty badly, so I patched that up quickly, but there could be some remaining bugs related to that or almost anything else (please report any you find). Neither movies nor savestates are backward-compatible for GB/SGB/GBC games (although it could be made to load old savestates again at some point in the future).

I did not change the GBA core this time.