New update on the status page by @cassie:
Certain scenarios were identified with the dynamic fee market that can impact performance on the network in ways that could operate as a griefing vector. A root cause is being identified, but release will need to be held back once more. We are setting a final ETA of 10/10, 11:00pm UTC. We greatly appreciate your patience.
To elaborate, the extensive testing that Cassie has been doing after implementing the dynamic fee market turned up a scenario that could lead to a chain halt or kicking out specific provers.
Undoubtedly many people will be disappointed by the delay, but unfortunately this is a showstopper that must be fixed and Cassie is working on it.
My personal take is that Quilibrium is a very ambitious project and it fills me with confidence that such a level of diligence is exerted at every step of the way and no shortcuts are taken that could compromise the soundness of the network.