I've run into the same problem with Champion Baseball as I did with Bosconian: it won't read the upper left/lower right joystick positions (or vice-versa as was the case with Bosconian). Is there a bit mask hitherto unexplored? I initially thought it may have been a driver bug, but I'm not sure now that I've run into it twice. See attached.
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I have officially retired from sucking at everything I do. Life is much easier now.