I've never had an issue upgrading to a new SolidWorks version. I upgraded from 2010 to 2011 SP02, and now I cannot open any drawing files without locking up my session, and getting a 'Not Responding' message on the task manager. All models open fine, but drawings will not. I tried creating a simple model, and then a drawing form the model, but it still locked up. Anyone having this issue?