Okay well I fail to see how your install does not do what every other install does if I visit it. I have gone to many sites aside from my own which I use for testing purposes. This comes right from the uploadproduct.php file and tell me if you do not see this code in your file.
Code:
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Basically if you only have ONE AD TYPE active what that code says is instead of load choosetype template then it just goes to the next step which is the template that has the catlist. On your install it is not doing this if you only mark on ad type active. Thus in my opinion you have a file that is not getting updated when you upload the new files. The code here is pretty absolute in this regard. Let me know if that code is not in your uploadproduct.php