"Canvas does not allow drawing" - I can't view invoices or print them

SUGGESTED

A new bug in our Sage Timeslips 2014 is preventing me from reviewing invoices or printing them.  From Billing Assistant, I select "Generage Bills" to PDF File, and I get "Sage Timeslips has encountered an error.  Canvas does not allow drawing."

If I try to generate the bill to display (Print Preview), I get a multipage invoice that is completely blank - no words or figures.  If i try to print it to a PDF, then I get the same error as above.   If I try to print it to a printer I get: "Printer selected is not valid" or "Operation not supported on selected printer".  

Egads.  Any help would be deeply appreciated.  It's running in Windows 8.1.

Adam