I've traced a crash in dedupe to a NULL entity. I've worked around that, but I should figure out why the entity is NULL. I've gotten as far as CRM_Utils_Hook::entityTypes($entityTypes)
it's return value seems to refer to a TEAM table that doesn't exist in CiviCRM. I may have created such a table in the same DB months ago, but I don't think it ever followed a naming convention that would have 'fooled' CiviCRM into categorizing it as a core table.
I plan to keep digging, but now seems like a good time to ask for advice. Anyone seen anything like this before?