APC UPS Not Recognized by Mac Pro / Yosemite

Following an upgrade from Mavericks to Yosemite, the Energy Saver Preferences Panel no longer recognizes my UPS (APC Back-UPS BR 1500G). Additionally, the apcagent client v3.14.12 says the UPS is "unknown", returning a status of "network error". Prior to the system upgrade, it worked nominally.
I performed the following trouble-shooting steps:
1) after running About This Mac | System Report... the UPS does show up in the System Report, under Hardware | USB: Back-UPS BR1500G FW:865.L2 .D USB FW:L2:
- this exonerates the Mac Pro hardware as the cause of the problem
2) changed the USB port receiving the cable from the UPS. result: no change
3) uninstalled/reinstalled agcagent. result: no change
4) performed a port scan using Network Utility. It did not report port 3551 on localhost as open (should it?)
5) deleted the Energy Saver preference files com.apple.PowerManagement.plist, com.apple.AutoWake.plist. result: no change
6) unplugged and turned off UPS, waited three minutes, replugged it and booted up. result: no change
7) unplugged USB cable for UPS from my Mac Pro, and plugged it into my PowerBook G4. result: Energy Saver preference pane properly reports the APC UPS
- this exonerates the UPS and the USB cable as the cause of the problem
So short of doing a clean re-install of Yosemite, I am out of ideas. I would appreciate some help!
http://apcupsd-ups-control-software.10985.n7.nabble.com/Yosemite-apcagent-td8675 .html

APC's software was not installed. That said, I uninstalled apcagent and rebooted. Results were the same: Energy Saver doesn't detect the UPS.
An earlier thread on this topic hints that this may very well be a Yosemite software bug: Yosemite doesn't detect my UPS
A user reports that a clean reinstall of Yosemite did not fix their problem.

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