I can't share the url because it is after I log in so I would be giving the forum a link to my account. A lot of big shopping website have you join the website and then shop.
Just to pick three well known companies I have not been successful at using credit auto fill are Amazon, Zappos and Victoria's Secret.
Here are the "general links" but you have to sign in to shop or give credit card info:http://www.zappos.com/http://www.amazon.com/http://www.victoriassecret.com/
I think Victoria's Secret lets you check out as a guest...
I have accounts with all three and use Stickpass to login. But during checkout the credit card info will not auto fill the credit card number numbers. Sometimes I can see the expiration date change with each credit card I try to auto fill, but that is all.
Because I have never seen Stickypass auto fill any credit card I am thinking you are being interfered with but do not know buy who/what.
As I mentioned above I run Windows 8 Pro 64 bit IE10 and Norton 360.