Interestingly I have exactly the same problem on all 45 of the ZEN77 4.1 f/w version units I have installed. I tried the rewrite all device links and still same problem - the ZEN77 does not report status event (button / paddle pushes).
ZEN77 800 LR with f/w 4.1
I can control the units and query - just not status reporting. No issues with GE / Inovelli / Jasco in same install.