Programs no longer working properly in Safari.

My wife is a teacher who uses a program called EdLine. In this program, she tracks her students' attendance, and grades. Since installing Snow Leopard, she is not able to open EdLine due to a constant EDPUTHTTPERROR message. She is not able to utilize this program on her MacBook Pro or my iMac unless we reinstall leopard as our OS. Unsatisfied with Snow Leopard in the few hours its been running.