Mark. From our emails back and forth I assume that the fix came from putting the Piezography folder back in >Applications under that name.
As a side-note to users, the Piezography folder does not want to be moved or re-named. It can break things. I will add warning scripts to the printer install pkg files or somehow fix this in a less annoying way in case a user renames or moves the Piezography on OS X.
cheers,
Walker