Topic: Fireface 400 only shows 8 channels input

Hello,
I have two Fireface 400's.  I recently bought a second 400 (bought used).  The first 400 shows all 18 ASIO channels.  When I connect the second 400 to the same computer with the same Firewire interface card as my first 400, it only shows 8 ASIO input channels available.  When I go to the mixer utility, I can see 18 channels input, 8 channels playback, and 18 channels output.  I am using Nuendo 3.2 on Windows XP-SP3, the firmware has been upgraded on both 400's to V1.70, and I am using the last ASIO driver from RME's website.  Can anyone help me get all 18 channels to show up?
Thanks, Chris