As a workaround, I removed one of the users who was supposed to have Administrator rights but did not (i.e., The Administrator checkbox was checked in the "Matrix-based security" form, but the user had no Administrator capabilities). I then re-added the user and added the user to the "Matrix-based security" form. I checked the Administrator checkbox and now the user does have Administrator capabilities. That's a pretty drastic workaround for, what appears to be, a bug. So, I'm still wondering if anyone else has experienced this.
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