Thanks for your thoughts about this! I'll try another computer as suggested and.....
I'll see about uploading a file if I can. It'll have to be in a few days but will see if I can.
MBP Retina, Mid 2014, 2.5 GHz Intel Core i7, OS Mojave
MBP Mid 2009, 2.66 Ghz Intel Core 2 Duo, OS El Capitan
G5 dual 2.0 Ghz, OS Tiger
G4 dual 500 hz, OS Panther