viewing a struct in ddd

I have a kernel driver and can break on its entry point and step in ddd just fine. This is a remote target, so I do a 'target remote /dev/ttySo' before connecting. I am using DDD 3.3.11 in Fedora Core 6.
 
I seem to be having an issue viewing structures in the driver with ddd. If I double-click on the structure definition, or an assignment to a member, I can get the structure to the data window. But when I try to expand the structure, it says "disabled".
 
If I go to the gdb window, I can do
 
(gdb) p structName     or
(gdb) p *structName    or
(gdb) printf "%X", structName->memberX
 
What could be happening that precludes displaying these structures in the ddd data window.
 
Charles