Thank you for your prompt reply.

I followed your instructions in number one above:
Launched the Console program and clicked "Clear Display".

However I could not Launch Sweet Home 3D.
When I clicked on it, it bounced on the Dock for a few seconds but did not open.

Below is the message from the ...

I downloaded the Sweet Home 3D 2.2 Installer version.
To install it, I clicked on the .dmg file to expand it, then dragged the Sweet Home 3D 2.2 application folder to the desktop. When I clicked on the application in this folder, it bounces on the Dock for a very seconds, but does not open. However ...