Originally Posted by JZL240I-U
What chmod exactly? Did you also change user and group?
Don't really understand how, but I kinda figured it out. In order for it to work, the key marked "fn" must be pressed along with the Apple or the Enter key. This works, now, in both the initial user and the second user accounts. I swear it didn't work before, but then again I have tried a lot of different solutions, so something must have kicked in...but I've lost track of what I did and when this started working this way.
So problem solved. More or less.
(For the record, though, and for the benefit of anyone else running an Apple computer: this is not a perfectly graceful solution to the one-buttonness of an Apple. Controlling exactly what is being right-clicked does not seem to be consistent between all applications. I think an external 3-button mouse is probably the best solution.)