Leopard, MacBook Pro and ArcSoft Panoramamaker

ArcSoft Panoramamaker was running perfectly on my MacBook Pro using Tiger. After upgrade to Leopard all software is still functioning properly, except Panoramamaker. The program even does not start. This is not the case on my iMac, where Panoramamaker works perfectly, with Tiger and Leopard. Upgrading Panoramamaker 4 to the "Pro"-version did not make any difference.
What went wrong? Installation of Leopard?? What to do?