Self hosted tracking202, prosper202 is working perfectly fine, besides for it will not work with SSL. I cannot use any secure postback links with this setup in this way.
Single domain on hostgator
I have tried different "modded" versions of prosper202 and also tried multiple reinstalls.
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without being able to look at what's going on, my 2 guess are that, you don't have ssl installed or it's not installed properly.
Also not saying hostgator is a problem, but from helping out a lot of our users, I've noticed that a lot of them have issues with hosting with hostgator. We are trying to work with them to resolve this, but until then YMMV