Very strange! Just you and just that one thread?
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So far it was only that one thread of mine that I could not unlock.The permission to lock / unlock own threads wasn't set for VPMs, but the one allowing them unlimited time to edit threads was. I tried setting the lock / unlock own threads permission to "yes" for VPMs, but I'm not sure if it'll help. It's odd that it isn't working, because VPMs are also in the PFM group (so they have the lock / unlock own threads permission) and the unlimited edit time permission of the VPM group should take precedence over the limit set for the PFM group. Maybe it's an add-on bug.
It was unlocked.Check it again.