I recently acquired Apple's TrackPad II (which is great btw). My rMBP is running Sierra and the TP works just fine. I also have a small partition on the drive with Yosemite installed for a legacy program that I need. While in Yosemite, the TP II is not recognized as a TP, but rather, a mouse with no right click ability ..it is really annoying & I horribly feel the absence of BTT functions...can't even touch click! Is there a known bug in Yosemite that I'm not aware of? A fix? Have tried to s/u through the normal methods (i.e.:; set up bluetooth tp, etc) also turned off BT PAN as I read in a few threads that people were having some trouble with a TP & Yosemite.