Thanks, Lynne. Your comments pointed me in the right direction.
I made some changes in the plug-ins but was still seeing errors. I don't fully understand why but went looking for other products and plugins that might be attaching to postbit hooks. I found an old 3.x add-on (product) that was working fine in the forums but had never been tried in CMS. When I disabled that, the errors disappeared, so obviously there was a conflict at that hook location.
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