Save As Won't Work

I am using Audacity 3.0.0 in Windows 10.
I tried to do a “Save As” of an Audacity file today and got this error message:

Error Saving Project
Audacity failed to write to a file.
Perhaps C: is not writable or the disk is full.
For tips on freeing up space, click the help button.

I checked and there is plenty of space on the C: drive.
I don’t get this message in any other app that saves to the C: drive.
What do you think is happening?

I regularly do a “Save As” to preserve the parts of a project that I want to save for the next one. Is there a limit to how many times I can do this?

Thank you very much for your help.

I think 3.0.0 “Save As” errors prompted the design of Audacity 3.0.2.


Audacity 3.0.2 also has Save a Backup which is a self-contained project that doesn’t insist that you stick around and edit it.