Does it stick to the pieplate? Try greasing the pieplate before putting the crumbs in and pressing them down. Using enough butter in the mixture? Some recipes call for 1/4 c. melted butter but I often increase it to 1/3 cup for 2 cups of crumbs and 1/4 cup sugar. Glass pan? Microwave the crust for 2 1/2 minutes on High, turning it 1/2 turn every minute. You might have to dip the pan in hot water briefly before cutting the pie to loosen it.