After opening Photoshop, Affinity Photo stops working properly

Once Photoshop has been opened, Affinity Photo stops working properly telling me that it does not have permissions to open files, and or that it does not have permissions to save files. The location and or destination of the files it is telling me it doesn't have permission to access are locations like the desktop, or folders within my own user folders - ie folders that work normally and folders that Affinity Photo most definitely does have permission to save to. So far this bug has happened only when both Affinity Photo and Photoshop have been opened at the same time (Affinity Photo does not re-gain permissions once Photoshop has been closed).

Has anyone else experienced these same issues?

Note: I *never* had a problem with Affinity Photo until after starting to use Photoshop