Stop Working on Save

[Craftsman]

Hi, Every time I go to save a project the programme stops working, I've had the software for a couple of weeks and this problem has just started. I've reloaded the software and still get the same result.

I am running Windows 7 64 bit
with a ASUS HD6770 (Radeon) 1GB Video Card
Intel(R) Core (TM) i3-2100 CPU@3.10 GHZ

Any clues why it might crash and loose all my work?

Thanks would appreciate the help