I'm using build 7137 since 4 days ago and I'm not having the problems you've mentioned before.
The unique thing I've noticed is the internal H.264 codec issue with nVIDIA Graphics cards that I've solved using other codec (using K-Lite Mega Codec Pack).
I'm using Windows 7 since early build 6801 and my system is running even faster and less "buggy" than builds 7127, 7100, 7077, 7057, 7022, etc....
I don't know if it's because my system specs, but I've installed this build in another 2 more PCs (in fact, one is a PC and the oter one is a notebook) with totally different hardware specs and everything is working good, without problems.
Let's wait if somebody got the same problems that you're having, guys.