Your latest test (preview) build you have voluntary opted to test shows a meaningless no-harm-done text when restarting or shutting down, one command does not work and a word in Start Menu kind of looks blurry first but then is shown OK. And, I almost forgot: you had to reinstall one driver.
The above means the entire thing went nuts to you? Making you wonder why "this sh*t is happening to me"?
I very sincerely recommend you to opt out out from the Insider program, use the Media Creation Tool to download the most recent official release TH2 version 1511, install it and forget any further testing. Doing it you don't have to experience this extremely frustrating, shrink-visit-demanding BS, a totally dysfunctional Windows.