Digital BW, The Print

I've always printed B/W picts on my 2400 with glossy stock (Museo, Innova and a few epson 
glossy papers).  No problems there.

However, I decided to try the matte cartridge on some enhanced matte paper I have.  I 
swapped the carts following the printer manual instructions.  Read to go.

However, when I switch to Enhanced Matte (or even Heavy Matte) paper in the print settings 
dialog, it changes back to "Color" and the Advanced Black & White Mode is disabled.

No amount of fidgeting about turns it on.  I did this from both Photoshop and the GM verison 
of Lightroom - nothing works.

In both cases, I'm letting the application (PS or LR) manage the CM settings.  This is on a 
Macbook Pro running X with the latest drivers from the Epson website.

Any ideas on what is going on?