Interesting gltches new to this build:
1. When traveling from my house to anywhere, there's a short stretch where cellular connectivity drops very low, or even zero. Most of the time, a bit further down the road it sees the next tower and all is well. But sometimes (like, more than 50% of the time with this build), if the cell signal drops to zero, I get the ghostbusters symbol for cell strength, and it never comes back. Just totally ignores all towers. Toggling airplane mode resets that.
2. Cortana on bluetooth is working much better with this build. Even mostly reads incoming texts again on my car (Dodge uConnect) system. But with this build, something I've never seen before, I can turn off & exit the vehicle, and the phone seems to not notice the bluetooth has gone away. Still thinks it's connected. That, of course, means no alert tones. And the volume buttons want to alter the bluetooth volume. If I go into the bluetooth settings, it seems to be hung. Only a power cycle reset fixes this one.
3. Lock screen icons (and also in Glance) don't update reliably to show incoming e-mail, texts, etc. Sometimes they do, most of the time they don't.
On the plus side, live tiles from apps that weren't working before (eg. Data Counter) have started working again. Most of my standard apps are functional, Cortana works.