My Image Garden (3.6.7) on Mac (11.7.10 ) unable to print to discs

[Joego8]

Last printed to disc 2 months ago using a PIXMA MG7720. Disc printed fine. Tried again today and got this message when opening My Image Garden "A required file may have been deleted or damaged. Reinstall this software."

I reinstalled the MIG (3.6.7) and got the same message. 

The only thing I can think of that's different is I updated the Mac OS to 11.7.10 after I successfully printed 2 months ago. 

Anyone have a solution.