If I call the scripts directly with the proper view=cycle or view=watch, etc. I am able to view the corresponding view perfectly.
Also, if I run /usr/local/bin/zmdc.pl check ... this returns "running" as it should. daemonCheck() in functions.php should be returning True.
The httpd logs did not show anything that caught my eye as an error.
I have included a screenshot of my console and the zmdc.pl check run. (The high number of events in each monitor pre-date this upgrade...)
I think I must have ignored something obvious while upgrading... but what?

Thanks,
Carlos