Strange first time behaviour. All except one of my MUI are apps are not opening. They show the splash screen and then immediately return to Start. A couple of them like Google search and Gmaps will stay on the splash screen looking like it's ready to load but never does. The only app that works is IE which is where I'm writing this post from. Desktop apps are working fine as well. I've checked for updates, rebooted my system and did the two-finger shutdown but this behaviour persists. The only change that I've made recently was to allow sharing of a folder with another pc the other day. Any ideas what the problem might be? EDIT: One more thing. After each reboot, IE is not holding on to cookies and I need to log in to accounts each time. What's going on here?