For some closure on this thread. The local bike shop removed my broken shield. The young mechanic said, "yeah these shields last about 2 weeks on Gary Fishers, they have weak tabs." He double checked the deraileur to ensure it would not interfere with the spokes. He did not recommend putting another shield on. I took the bike for a ride and it was much improved. I hadn't realized how much drag the wedged shield was having on the efficiency of the bike. I wonder if someone has given Gary Fisher some feedback on the flimsy shield tabs.
Many thanks for all the tips from the clever people on this forum.