Creating a new Сanvas leads to an error “Failed to load “…/Untitled.Canvas” Unexpected end of JSON input”. TAKE 2

This bug has been previously reported as a firewall issue - but I have no firewall running on my mac! Any advice is welcome!

Things I have tried.

the usual of rebooting device. and restarting software

Similar to: [Creating a new Сanvas leads to an error “Failed to load “…/Untitled.Canvas” Unexpected end of JSON input”