Hi Alan-
I'm not sure about your FC3 problem, but I can tell you that I *endless* problems with Labview and Redhat 9.0.
After many years of referring people to comedi for 3rd party drivers, which are a nice start, but are very buggy, NI finally seems to have a set of drivers it supports on it's own. Don't know how they work, because I never tried them; when I finally got fed up, I went back to MS (ugh).
Anyway, just a caveat.
Hope you are able to find an easy fix for your particular problem.