Interesting development - updating to 10.6.2 has solved the 'broken architecture' issue for my OKI B410 driver, so I now have duplex printing back - though stupidly, you have to not only select the duplex option, but also check a new Two-Sided checkbox before it'll actually print duplex - redundancy abounds:



The hilarious thing is that I discovered this whilst printing out a letter of complaint to OKI UK about how they haven't fixed their driver yet! Oh well, saved some postage at least.
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If it's brokenless, don't suffix it...