I have noticed that after upgrading to 10.10.2, when I start up my 2013 rMBP with an external monitor on a Thunderbolt->DVI adapter I get no video on the 2nd monitor. I have to unplug and replug the adapter and then it works as it should. This never happened prior to 10.10.2, and has happened every morning since. It's not the end of the world, but wondered if anyone else had seen this, or had a quick fix suggestion. Thanks!