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No addreses conflict, tried it with various IPs, I don't know that the router stores ARP entries in a viewable format, they're not implicitly set by us anyway. Hopefully rebooting them should get rid of that issue???

From what you say here and what you've posted in follow-ups, it does small like an ARP issue (masks look conventional/OK, no DNS dependency -- problem producible at IP level). If bridge is storing misassociated MAC for that IPin ARP table, then that would explain. If you can afford to power cycle bridge/s real soon, I would do that before pulling any more hair (yes, it should clear ARP entries/cache....I always count to 10 while powered off!)
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Jim


'Tis the exceptional fellow who lies awake at night thinking of his successes.