We recently converted from 2013 to 2015, and it seems like we made a huge error. 2013 ran like a champ on my computer. Not problem free, but very few and far between. Now, 2015 locks up at random doing the most mundane of tasks (rotating model, zooming, rollback, etc. No, it is not my computer. I have been using SW long enough and configuring custom boxes enough to eliminate all the usual BS questions that are asked when a topic like this is posted. The problem is Solidworks. What I want to know is, has Solidworks acknowledged the issue and are they doing anything about it? It is seriously hampering my productivity. Support and take some pride in the product or get out of the game.