I recall a somewhat lengthy conversation with Sin about a year ago, that supported Arch's findings and denied Ellias' claim. That the "roll" is calculated at prospecting time, not when the planet was created.
You know Clarr, you could just explain how it works rather than just saying "No, its not how you think" and then disappear again until this discussion pops up again. Considering the amount of mining and prospecting that is going on its an important thing to know.
Cache shouldn't have anything to do with your ETA getting stuck in a 59sec loop either, but that was one of the possible culprits suggested by those supposedly in the know (and like ah said, it shouldn't hurt, unless you want/need to keep mining Rudic)