I'm having a problem checking out bundled products in Magento. When you proceed to checkout with a bundle product in the cart, the checkout page just shows a blank page. This problem doesn't appear when checking out with a simple product.
I installed a new onepage checkout extension which seemed to solve the problem. However I've been doing more testing and found if I was logged in as a customer and tried to checkout with a bundle product I would again see a blank page.
After doing some research into blank screens appearing during the checkout, I found many people saying increasing PHP memory will solve the problem, I've tried this to no affect.