Hi @jimrapt
I don’t think this could be a bug since I cannot replicate it, it has something to do with corrupted database entries.
I would recommend you restore your database to a previous copy if you had it backed up, if this fails you might need to do a fresh install of your WP.
It is also imperative to try to identify if the update might have brought up possible plugin conflicts that could be causing this behavior. You can do this by deactivating all other installed plugins.
