This morning I found an email from a highly placed Vexctorworks executive, asking for input about my specific issues as described in my posts above. He asked for documentation on the workflow causing my issues. Instead of doing work-for-pay, as scheduled this morning I spent an hour or so recreating the scenario. While the 2019 Hidden Line render performed more predictably today, I encountered the dreaded 0:03 second black render, which was followed by the funny render shown below when I set the bounces to sixteen from four. The same file, down converted to 2018 with same render settings is shown in second render.
I closed my reply to said exec thusly:
"I hope you find this information of some use in solving the issues in this release. Please do know that, really and truly, I value reliability far more than new tricks.
Trix are for kids.
I eat oatmeal."