I cannot seem to print anything with IE9 under W7-64 with our Canon iR C3380 printer. The printer does not work in PS mode, just PCL and it has been perfectly fine for our use up to the IE9 rollout where we get the same error over and over and over, regardless of what we try to print in IE9. Users in the office that haven't rolled up to IE9 are printing fine still in IE8.
I attempted http://support.microsoft.com/kb/308260 and it didn't help.
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