Hi, This is the first time is have asked a question. I have a 13" 2012 Macbook Pro with Mojave. I keep it updated. This morning when I started my Mac, it was grey and the little dashed line that looks like some sort of update was clicking along. When it completed that process it went to the log in screen. At the log in screen, the background was dark and all around the space where I normally put my password had multi-colored concentric circles radiating away from that space. I typed in my password, and then opened to the main screen. When it completed start up, my background was like "Little big Planet" (a kids game). I immediately shut it down and restarted my system. It restarted normally. I spent all day trying to figure out what it was. I downloaded AVG antivirus and didn't find anything. There was a strange file on my computer yesterday .#webloc (?). Does anyone know what it was or could what I should investigate further to find the answer. My kids just said my computer was trippin!