Debugging network printing

[Darin McBride]

I have an HP2600n color laser printer that I'm trying to get to work.  I
downloaded and installed the foo2hp driver from http://foo2hp.rkkda.com/. 
It compiled and installed with one caveat: the color queue doesn't want to
work.  Nothing seems to get to the printer.

Briefly, my system:

* OS: Gentoo Linux
* Cups: 1.1.23
* Cups configuration:

AccessLog /var/log/cups/access_log
DocumentRoot /usr/share/cups/docs
ErrorLog /var/log/cups/error_log
LogLevel debug
PageLog /var/log/cups/page_log
User lp
Group lp
SystemGroup lp
<Location />
Order Deny,Allow
Deny From All
Allow From 127.0.0.1
</Location>
<Location /admin>
AuthType Basic
AuthClass System
Order Deny,Allow
Deny From All
Allow From 127.0.0.1
</Location>

* Queues:
  o hp2600n-bw
  o hp2600n-color
  o hp2600n-raw

* What works:
  o Any printing to hp2600n-bw
  o Manually converting a PDF to PS, then feeding it through
foo2hp2600-wrapper to create a .zm file, and sending that to hp2600n-raw.

* What doesn't work:
  o Printing directly to hp2600n-color

According to the printer, it doesn't even see the color request unless I
manually send it raw.

What I'm trying to do is decipher exactly where the problem is.  Given all
of the above, I can't figure out why the color printing isn't working - all
the pieces seem to work fine in isolation, just not in concert.

The only difference between the -bw and -color ppd's is the DefaultColorMode
line (according to diff):

# diff -u *
--- hp2600n-bw.ppd      2006-02-27 21:32:53.000000000 -0700
+++ hp2600n-color.ppd   2006-02-28 18:08:19.000000000 -0700
@@ -177,7 +177,7 @@
 *OpenUI *ColorMode/Color Mode: PickOne
 *FoomaticRIPOption ColorMode: enum CmdLine A
 *OrderDependency: 120 AnySetup *ColorMode
-*DefaultColorMode: Monochrome
+*DefaultColorMode: Color
 *ColorMode Color/Color: "%% FoomaticRIPOptionSetting: ColorMode=Color"
 *FoomaticRIPOptionSetting ColorMode=Color: "-c "
 *ColorMode Monochrome/Monochrome: "%% FoomaticRIPOptionSetting:
ColorMode=Monochrome"

I'm hoping someone can give me some pointers.

Thanks,