Hi Everyone
I'm having exactly the same problem after upgrading to 6.01. It all worked fine before.
After searching the web it seems this problem occurred last year also when people upgraded from 5.01 to 5.1. Most said the problem was the screen protector interfering with the sensor. So it seems the cure maybe going back to previous system or removing screen protecter.
Neither of which I want to do!! So it seems we're stuck - unless anyone has any other suggestions?
Thanks