iPrint Appliance Canon IR Copiers printing from iPad

So I deployed the iPrint Appliance 1.0.1.69 to solve our "Can't print from iPad" problem and now am getting stuck at the printer/copier. We're getting a PDL IMG DATA INVALID error on our Canon IR 4075.

Anyone else have this problem and conquered it? Any suggestions where to start?

I enabled LPR support, which didn't make a difference.

Any advice would be appreciated.

Works fine with our HP printers.

Thanks,

Rich