Suddenly "Ignoring sketch with bad name"

I'be been using the Arduino IDE on this computer for years with no issues. I always kept the version updated to the newest. Today I updated to the latest version 2.0.4 and now whenever I open the IDE I get an error message "Ignoring sketch with bad name" as the titles and the message conveys sketch name conventions.

The issue is that my sketch names have never changed. I have used spaces in many sketch names with absolutely no problems.

I uninstalled it and reinstalled my older version and I get the same thing.

Why would it suddenly complain about naming conventions?

See "Invalid sketch filename" dialog when opening sketch in 2.0.4 for details

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