I checked stats this morning and was able to see my January downloads.
I've found the downloads page to be highly flaky. There are days when I see more downloads when I select a specific date and click view than when I look at the whole month list. Sometimes it's the other way around - sale that show up in the list for the whole month but are missing if I select just that day to view. In general things sort themselves out over time though and given how far we are into January, I'd contact support about this.