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You're a genius! I looked in newbb's class directory and saw that class.forumposts.php contained 0 bytes. I re-uploaded that file from the upgrade patch, which was in the neighborhood of 13K, and it now works just fine.
Rich, thank you so much for your help. I would have been pulling my hair out for hours over this and would probably not have thought to check file size, or the possiblity of corrupted files, for a while, if at all.
I think it may have occurred because I simply did a one click batch upload from the html folder in the upgrade zip, and it may have corrupted this one on the upload. Hard to say. But you are a life saver! Thanks again!