Strike that … ALL internal links now return 404 errors. Nothing has changed on the backend except for a recent installation of Gallery2 plugin. However, even when deactivated, 404 errors persist. Using Gallery2 plugin requires a Gallery URL Rewrite plugin that I have since also deactivated, but the 404 errors persist.
Whew! Does this imply a bug in the Gallery2 URL Rewrite Module, or a problem with my overall Gallery install?
I’ll admit to using the Gallery plugin within WordPress installed in the domain _pointer_ caseycuddy.com. The Gallery app install is in the root domain cuddy.org/media/. The Gallery plugin validates perfectly, though.