I know this is an old post, but I have now encountered exactly the same after problem after upgrading to 3.32 and ZBrush 2021 (I upgraded both at the same time - stupid me
:crazy:). I hadn't used this workflow for more than a year, but it worked fine as far as I remember.
What was the outcome of this , sylwester? Or has anyone recently had the same problem?
@ Peter: I am using my administrator account...