I seem to be having an issue with both my Mac Mini & Macbook Air on Sierra and wondering what I can do to fix it. When I get a Beta update, it seems to go from the downloading bar to installing. Then after a few minutes it tells me to restart my computer. So I restart the computer and it shows the Apple Logo with the loading bar and it only goes maybe 2 inches a freezes. It will just stay that way. After about 5 minutes I will hold down the power button and restart, it will then go through the boot, and restart again and then come back on to the lock screen. Once I put my password in and it logs in, all my windows are open and I go to About Mac and it shows the update installed. Is this a common issue or is there a fix for this? It's making me worry if the update really installed.