I have a 2010 MP (OSX 10.8.1) with a APC Smart-UPS SMT1500 connected and it has worked fine since I purchased in Dec 2011. However, I just noticed that it is no longer detected in the power settings...but it IS listed as connected on the usb tab under system profile? I connected the UPS to my mac mini (OSX 10.8.1) and macbook (OSX 10.8.1) and it is detected right away and works as advertised on those 2 macs. I talked to APC and they say it's working fine if it's detected on the other two macs. Things I've tried: 1. PRAM reset 2. SMC reset 3. Deleted the power management plist file 4. Switched usb cables and ports No luck so far...any thoughts? Thanks in advance.