Ok, then that seems like it's a problem with a plugin using hook location newthread_start. I don't know why that would happen all of a sudden, but you should probably go to the plugin manager and sort by location, then see what products have plugins there. You could disable them one at a time and see which one makes the problem go away. If there really isn't any problem with any of the plugins, it could have been the datastore, and maybe just enabling and disabling them will fix it (because it forces the datastore to be rebuilt).
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