Your example script was just code that you copied from the Zorro manual. So, no, I can not confirm a STEPWISE problem. But you can anytime contact Support and explain the problem and its circumstances in detail. If they can reproduce it, they can also tell you the reason.

Do not wildly change back to old versions in hope that this will fix it. Something that does not work under 1.66 will most likely not work either under 1.70, 1.80, or 1.90. You should find the reason of the problem, or let Support find it.