Quite a few people seem to have issues with Parallels/OPENSTEP/Mach, so let’s at least remove Parallels configuration from the list of unknowns. Try this PVS file, see if that helps. BTW, anyone having problems, what host system are you using?
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OOP the Easy WayObject-Oriented Programming the Easy Way: a manifesto for reclaiming OOP from three decades of confusion and needless complexity.