The os4 uses petunia for emulate all 68k codes, the pre-release have built-in the 020 emulation, but the petunia full emulates 040+fpu (no mmu)
http://amigos.amiga.hu/rachy/petunia.html,i think emulating programs or libraries using mmu can have any type of problems. The best method is install all 68k soft and choose the cpu for dont have problems.
Cheers
