Monterrey MacOS 12.3.1 upgrade causing errors reading external drive used by 3rd party applications
I own a MacMini running Monterrey. After installing upgrade 12.3.1 two applications I regularly use and that have worked correctly for 2 years (OM Workspace and Nikon NX Studio) now cannot access the external hard drive on which the files they manage are located. An icon for the external drive appears on both applications but there are no directories or files visible. If it were one application only I'd suspect the application, but not 2. I'd appreciate any suggestions for resolving this problem.
Mac mini, macOS 12.3