Okay, some light on the mystery. I started playing Chaturanga again, and got on the boards for it. Apparently no matter how many games you may have played before, you have to have played a certain number of games in the variant SINCE the Leaderboard feature was added recently, in order to show up on it. Not sure how many games that is, but a half dozen or less.
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I've got ratings in most of the variants, but in only a few of them (3 Check, King of the Hill, Gothic, and maybe one or two others) does it show a ranking for me in the Leaders List. I thought it might be because I hadn't played those variants in a while, so I started playing them again, but still nothing. Is there some trick to it?