Freeze on Super Street Fighter II intro when started by a launcher

[foxp4v]

As i wrote in the title there is a freeze in SSF2 and SSF2 AGA when i launch them trough launchers like MEGAAGS image or Tiny Launcher, in these cases the game freeze in the intro with Ryu charging the fireball. The strange thing is that if i start them from the same HD images but through the Workbench they works without problems. A friend of mine tried the MEGAAGS image on a real Amiga 1200 and didn't have these issues.