Tim,

Have a look at these 2 links.  I'm wondering if the driver install isn't quite right.  I know these instructions are for the XLX utility, but the driver install is probably identical.  I also used the 1.3.6 driver since the newer 1.4.8 did not work.

I'd try and get the 1.3.6 drivers first.  I got them from the XLXbbs:

make sure you have the build-essential and g++ packages installed

Then follow this to install:

Be sure to also add your username to the device group.  (i.e dialout for debian in the device group)

Mike, AA9VI