PageStream 4.1.5.6 is working fine here under MorphOS 2.2
The only thing I had to do in order that PageStream NEVER crashes on startup is to disable completely the contents of the "CSet"-folder. Try the following, which worked for me, create a "disalbled"-folder in the folder "CSet" (which is in PageStream/Softlogik/) and then move all the files in this "Disabled"-folder.
I think this has something to do with codeset handling or so...