Just wanted to get these issue out there. I'll gladly go into more details if anyone is interested. Not asking for support as seems to be the assumption by some. I'm trying to help identify the issues here.
I'm having several problems that popped-up new with this Insider version as well. Start11 taskbar flashing and not recognizing any mouse clicks, right nor left buttons. The same problem I had with coming out of sleep mode, or even screen saver (which I have set to blank the screen) the Start11 taskbar drops down as if the previous location at the top of the screen is now reserved for something else, but now it also comes back covering only 3/4 of the horizontal real estate. As if it is painting in 16x9 instead of 21x9 aspect ratio of my main monitor.