An update was released to fix a crash bug and couple of other things in Physworks.
V1.2.1 Update:
- Fixed crash on sandbox setup when entering special European characters
- Settings now display "Off" instead of "0" when turned off
- New tile and thumbnail images
- News feed no longer shows "Update Available" when running a later version than given in the feed XML
If you haven't tried Physworks yet, grab the trial from the Windows Phone Store!