Double clicking the mouse doesn't work to open my iMac desktop folders

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

Download and run Etrecheck. 

Copy the report

and use the Additional Text button to paste the report in your reply.

Then we can examine the report and see if we can determine the cause of the problem.

Please determine if the same problems occur in "Safe Mode": Use safe mode on your Mac - Apple Support

my guess would be some third-party system modification you have installed. Perhaps a third-party mouse or keyboard driver.

cg270 wrote:

I go to open my desktop folders this PM by double clicking the mouse - doesn't work. It worked fine this AM, but now the feature is defunct --- I know Apple hates me because of what I say about them. I google a query about this problem and find responses to this problem that go back to 2007 - I know Apple is continually devolving hence the leap back 17 years (back to the future anyone?). Anyone have a SIMPLE solution to fix this that a less than stellar tech user can navigate?

Slamming Apple while providing absolutely no relevant information that could be used to troubleshoot your problem, in fact, not even bothering to actually describe the problem beyond vague ramblings, is not a good way to entice the people on this forum into helping you.

Thx - I will try this sometime today.