Jam Packs not loading in Logic Express 9

I recently installed Symphony Orchestra Jam Pack on my MacBook Pro and the Jam Pack s/w instruments will not load in Logic Express 9. When I select an instrument, it just hangs and I have to force quit. The Jam Packs work fine in Garage Band. I had both Logic and GB installed before installing the Jam Pack. I am using Snow Leopard and I have all the most recent updates. Has anyone seen this issue or can recommend a fix?