So, I've upgraded my 2011 MBP to OSX 10.10.3 and my iPhone to iOS8.3. All seemed to be ok, but things are starting to lag... The biggest problem is that when my iPhone is plugged into my mac via the Lightening cable, the screen no longer responds to touch, nor does touch ID. When I unplug it it works fine, but it's so annoying, especially when the battery is low and I need to use it whilst plugged in. Anyone else getting this problem?