I recently upgraded to 2013 and found that when you try to do math functions from with in say a dimension field it doesn't seem to work. It just reverts back to the original number. Division seems to work fine but adding, subtracting or multiplying doesn't have any effect it just reverts. Is there a new setting I'm not aware of? I really liked this functionality because I don't need to have a calculator right by my side, I can just do everything right inside Solidworks.

Thanks!