In Software Update, it will show 10.10.1 as available, I click on update and for a few seconds it says "installing", but then just says "update" again as if I never clicked on it. I manually downloaded the update and opened the installer. When I click "install", it finishes in 2 seconds (like its not installing) then asks me to restart. It restarts like normal (doesn't show updating/installing) and in "About Mac" still shows 10.10. Any ideas? Thanks.