Canon 6100 Communication Error

I have a Canon 6100 All-in-one printer/scanner.
When I first installed it (under Snow Leopard) it would often throw up a 'communications error' when sending a print.
Pausing the print, then resuming would make it retry and the print would go through. Annoyingly, this always required the admin password to be entered.
At some point I found a simple fix that stopped these errors completely.
After upgrading to Lion, it continued to work well, until a printer driver update appeared in software update. Following this, I'm back to communication errors and entering the admin password.
Unfortunately, I can't remember the simple fix. I'm guessing it's a permissions issue that's been overwritten by the updated driver files.
Anyone had a similar experience? I've tried googling for the fix without any luck.
Cheers

I should add that the printer is actually a 6150

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