Not sure what happened here, but with the new build I cannot use my McAfee software at all. For some reason Windows Defender is now active and any attempt to shut it down in the Settings ends with failure. Switch it off, and it comes back on almost instantly. I can kill it from the Task Manager, but it restarts a few minutes later. McAfee software has some entries in the Task Manager, but I cannot open the main UI screen for it.
Also experiencing a LOT of apps that will not load the first few times I try. Some only get as far as a splash screen and lock up, and if I minimize them they just crash out and die. Other apps will get past that point and start to load, but never quite get there. Most often this is the Feedback Hub, Windows Central and Twitter. I've had to try up to 6 times to finally get an app to load up and run.