Yosemite 10.10.3 - Crashing

I've got a new Macbook pro, loaded up Pro Tools all seemed to work fine until i updated the Mac to 10.10.3 - Now my projects won't open, all I see is the wheel of death. Starting a blank session seems to be fine but for all my existing projects it crashes. I've uninstalled PT and installed again, strangely I could then open the existing projects, only to try opening them the following day to see it crashing again. Anybody encounter similar issues with 10.10.3 and got any suggested fixes?