On my L930
While there have been a number of welcome fixes, the most critical bugs ("unwanted features") remain,
"Loading..." and "Resuming..."
Upgraded from 10512, through the two builds, and ended at 10536.1004. Then Hard Reset.
Load back apps. I've loaded about 50 apps, personalized the Start screen with pic background, color change, and created multiple app folders (using built-in feature), 7 app folders including the default folder created by MS.
Less than 24 hours with the new build, loading and resuming are back.
Both bugs reported to Microsoft (stating the obvious here, lest someone remind me.)
Resuming most often occurs when backing out of an app, to Start screen, and backing out of Start screen, to previous app.
Loading, no pattern identified yet. Came out of it on its own after a couple of minutes. On one occasion, much longer, and I had to play around with the Settings to try to force it out.
Hope others are having better luck and not seeing the same results.
On my L920
Upgrade from 10512 to 10536.1004, no hard reset, restore from backup.
Still working fine.
I only use this phone for podcasts while driving.