Kensington's Technical Support team solved my problem with my 2007 Expert Mouse Trackball. The Trackball has performed flawlessly for eighteen years (bought it via Apple online), but I was having problems programming the Trackball's click buttons after I upgraded my 2015 Apple MacBook Pro (and Intel processor) to an M1 MacBook Pro as well as jumping from OS High Sierra to OS Tahoe. Kensington Technical Support answered my questions quickly and successfully.
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