It sounds like a problem relating to the fixes we submitted to the store last week, although that normally relates to Undo rather than direct crashes. The new update should be available in a few days as soon as the App Store review process is complete. In the meantime, please make sure you have cleared out memory and rebooted following the instructions in this thread: http://www2.ambientdesign.com/forums...es-or-Crashing
That may help in the meantime in case there is a memory issue.
Matt
ArtRage UI
Ambient Design.