Quoting myself... narrowed it down to poseidon.prefs in sys: prefs/env-archive/sys/poseidon.prefs ...removed it from both machines and now they boot without issues... hope this info helps someone experiencing the same issue with this new MorphOS release.
Cheers,
Dragster
I have seen this suggestion in several places but sadly it hasn't worked for me. But the Team is working on the problem and I'm not worried. Nothing is lost anyway.