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Forum Sage
I've had issues when ordering from other companies, not always using PayPal, where the screen goes blank after you commit to pay. It never gets to the confirmation page. The companies have told me that they've had trouble with orders going through on certain browsers. I usually use Chrome. Sometimes I have to use IE which I dread. Did the blank screen happen to you and did you try a different browser?
I was going to suggest this to the OP. I use Firefox and have a bunch of privacy-related add-ons installed. I use adblock, ghostery, and so on. There are a lot of sites that just plain don't work with all this stuff enabled, so what I often end up doing is running a different browser with no addons enabled (in privacy mode) that I _only_ use for buying stuff on random sites. Convoluted, but it works for me.