Accessing Previous Purchases

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http://askubuntu.com – I purchased Steel Storm Burning Retribution back in 2011. Now that I have a new laptop with 13.04 I logged in to the software Center to re-install it, but the Previous Purchases screen comes up empty. I can search for it, but clicking on More Info results in a message that it's not available in my current software sources. If I don't log in, I can see it and have the option to buy it. Any ideas what could be happening? (HowTos)