I am running SQL 2012 SP1, CU4 on Windows 7 Pro and have made no significant changes recently, with the exception of updating some Redgate tools.
SSMS has taken to crashing several times a day, and when I start it up it open many empty windows - like 30 to 50 - and then often stops responding and crashes. Sometimes it will stay up for a bit and I can close the project to close the windows, but I can no longer do that. It stops responding and crashes every time now.
The system rarely gets shut off, so I'll try a restart to see if that fixes it this time, but it has not worked in the past.