If this helps, the unknown opcode message generated by trying to sell something to a merchant is "0x2720 size: 16".
Trying to buy something also locked up the client but didn't seem to generate a similar message.
I've actually found 2.4 beta to be much more stable than 2.3, I've never once got a "you have been disconnected" message or been booted out to the login screen when zoning or dying.
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