Thanks, I am checking on the permissions. However, this is not an issue when running Simulink 2018a that's installed on same machine and accessing files in the same directories...
Error Message - File is Not Writable (Simulink 2019a)
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When saving a Simulink file (slx or mdl) a message appears "The file "C:\pathname\filename.slx" you are trying to save is not writable. Simulink can attempt to make it writable." After selecting option "Make Writable and Save" an error message appears: "The file C:\pathname\filename.slx" you are trying to save is not writable." The file was originally created in release 2018a and did not have this issue when saving. Similar messages occur when attempting to export back to release 2018a. How can a file be made writable?