HTC One (M8) — Android 6 Update - Lock Screen appears with White Screen

Hi

I have updated my HTC to Android 6.0 yesterday and since then i have a problem in seeing a white screen while i locked my screen;

I see white screen and after pressing back/home icon - it took me to Lock screenwall paper and Lock Pattern to get me log in;

I hate this white screen while locking, Any idea why this happen? this happened to my friend as well he has same HTC one M8

This issue seems sorted and i had other issues now related to "Pull down Menu" not working