I have never tried Exult partly because I heard it was buggy.
:idea: But here is a suggestion for you:
Dowload TotalChaosAGA and run it.
If Total Chaos works 100% perfectly then Exult has a problem.
If Total Chaos won't run then software hacks on your system are causing the problem.
The reason I suggest this test is that both games are very large and complicated and run under the OS and multitask and don't take over the machine and hopefully stress your system in the same ways. And because I know for a fact that Total Chaos is 100% AmigaOS compliant and it is run on a wide variety of systems around the world every day. Oh and Total Chaos AGA was specially coded for 040 and 060 processors, which you have. :banana:
Good luck! :-)