No workaround found for the games I listed. Tried nocache, cache, novbrmove, noautovec... None of them worked.
Well as said before, every single accelerator has its incompatibilities with whdload games. If I really want to play the games and demos (like world of commodore 92) that do not work with an accelerator, I remove it and the ACA500 plays them just fine.
Well this is not related to ACA1221 but ACA500, sorry for the OT Jens I will stop there.