Just a report back from IRC land (with moovida and mauro). Frank your "rollback" of blackboard synchronisation locking has removed the deadlock.
Thinking about it for a bit: a) your change is nice and clear (I see you experimented with different locks) b) what we missed was consider thread locking used by tools - as depending on which order they access the blackboard they could (and did) manage to deadlock themselves I also checked the use of "EditFeature" which was the change I suspected of causing issues. Turns out it is not used by edit tools at all and can be ruled out as a cause of trouble. -- Jody Garnett
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