I'm not sure when this started but I noticed in Energy Saver the other day that I no longer had any settings related to the UPS device that my 5k 27" iMac is plugged into. I never installed APC's software and would prefer to use OS X's built in monitoring software. This was present on 10.11.3 and continues after updating to 10.11.4. I tried an SMC reset and changed the usb cable - neither worked. USB cable is plugged directly into the iMac (not to hub). Plugged the USB cable into a Macbook and it instantly showed the UPS was connected in System Profiler and in the Energy Saver settings. Any suggestions on getting the iMac to recognize it is plugged to a UPS? Thanks!