Go into Go to Settings > Display & gestures > Motion Launch gestures. Make sure the feature is enabled. If the problem is still there take a look at this post about what to do to troubleshoot issues that may be occurring after an update: Android 5.0 Lollipop bugs got you down? Here's how you (might be able to) fix them | Android CentralI finally got the manual AT&T update to work last night, however I noticed that the double tap/triple tap to wake does not work. Does anyone else have the same problem?
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Thanks for that. I figured it was something like that. Hopefully they'll fix this soon. It was my most favorite feature.Don't bother doing a factory reset over this, it also causes double/triple tap to quit functioning. Only if you take the OTA cleanly and don't factory reset does that feature work. Resetting and doing a manual update break it. It is a know bug. Hopefully, a fixed will get pushed soon.