OK - I have a tentative answer. I reverted back to MediaWiki 1.15.3, and all was well. I successfully upgraded to 1.15.5, and all was still well. I upgraded to 1.16.5, and all continued to work fine (other than a minor issue with a date preference, but that was easily fixed). Each time I was keeping copies of the DB as well as full copies of the file directories in case I had to revert.
Which came in handy, as when I upgraded to 1.17.5, it failed completely and wouldn't display anything other than a blank page, along with no obvious logs or errors to check into. I reverted to 1.16.5, and it seems like it will stay there for quite awhile...
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