Acrobat 9 bug - will not print PDF in B&W on color PS printer

OS: Windows XP Pro SP3

After upgrading to Acrobat Reader 9, I find that PDFs cannot be printed in B&W on a color PostScript printer. Other documents print fine; it's only PDFs that have this problem. Selecting the "Black & White" option from the print dialog still emits a color document. This is eating up a lot of extraneous color toner!

I've even hacked up the PPD file and added the following to try and get the DeviceGrey option to "stick:"

*OpenUI *ColorModel/Print Color as Gray: Boolean
*OrderDependency: 20 AnySetup *ColorModel
*DefaultColorModel: CMYK
*ColorModel CMYK/Off: "<> setpagedevice"
*ColorModel Gray/On: "<> setpagedevice"
*?ColorModel: "
save
currentpagedevice /ProcessColorModel get
/DeviceGray eq {(True)}{(False)}ifelse = flush
restore
"
*End
*CloseUI: *ColorModel

That makes a new option appear in the "Advanced" pane of the dialog (Print Color as Gray: On/Off) but PDFs ignore that, also.

Selecting "Print as Image" works, but that bloats the print job. On large documents this could cause a vast slowdown.

This doesn't appear to happen in previous releases of Acrobat Reader or any other application I've tried, and a call to Adobe tech support met with a brick wall and no ability to escalate this any farther.

What would be great is a PPD command that Acrobat Reader obeys that would default this printer to B&W mode. Nothing I've tried thus far works. *ColorDevice: False and *DefaultColorModel: Gray are ignored too.