Ok... So you have two SCXI-1000 chassis and one SCXI-1102, correct?
One SCXI-1000 chassis with the 1102, but the other doesn't.
In the good chassis, what is the chassis ID set to?
When you swap the two SCXI-1000's, everything is hooked up the exact same, correct? What terminal block are you using? Do you reset the chassis from MAX after you swap everything?
If you try to put the SCXI-1102 in a different slot of the bad chassis, is anything different? Do you get any errors?
Has the bad chassis ever worked?
Check these out:
http://digital.ni.com/public.nsf/websearch/209C26A1EDC44A1D86256CC5007506B0?OpenDocument
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/e8064c591c5fda1a86256a4d00817c1c?OpenDocument
-Sal