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Ok, now this really makes no sense. I told my partner about the problem, and she logged in and could not duplicate the error. Her notifications page worked fine.
I made a new account for myself, with all of the same settings of my original master account. The new account did not generate the errors, but my original account still generated the errors even with the same exact settings.
The only difference between the two accounts was that articles were posted under the account that generated the errors. Well, I tried posting some articles under the new account name, and then the error starting appearing under that account name too. To make matters more confusing, the errors do not go away even after I delete the articles. In fact, the error occurs even while posting or modifying a News 1.44 article, not just when I click on notifications in the user menu.
Thus, there is some problem with the notifications system that only appears after at least one article is initially posted. I'm not sure if this is a problem specifically with smartsection or News 1.44, or if it is a problem in the system core. The error messages so far are only specific to News 1.44 and Smartsection.
Anyway, this problem appears to be a very serious one. I don't think I can open my site to the public until it is resolved. Any ideas about this?
Dave