Control-click (as sub for right-click) weirdness

Sadly, there are still some folks who are clients of the company I work for, using our online app (that we use CKEditor in) who are still running single-button Mac mice.

At least one of our users is having issues in this regard, using the editor - trying to bring up menus within the editor that normally show with a right-click - image properties, table properties, that sort of thing.

I've been poking about the last little while in various instances/installs of the editor:
1) The install in my app
2) The "fullpage" sample page (on same server as #1)
3) The demo on CKEditor.com

Doing control-click as a substitute for right-click seems to work fine on #3 - but on my server, both #1/#2, it's not.

I suspect it's a config issue, a difference between the demo's config and mine - but I'm stumped as to what that could be.