I generally wouldn't rely on the "estimate" reports. Just like view counts etc, they sometimes pause. I've had times where I was under the impression I wouldn't make the $100 monthly threshold because it was reporting somewhere around the 60-90 mark for the past 30 days (the minimum is 100 for a payout) only to actually have a lot more end up showing up. Not sure if that's because of the American/Australian conversion, but generally I wouldn't pay much attention to it. It's an estimate for a reason, and sometimes there's bugs and delays in reporting. If it goes for a week then maybe be concerned. You should also check the monetization status of your videos as well. But I rarely check it.
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Ok, so I just checked and from december 6-7 (actually, december 8 as well) it says "data processing" which probably means exactly that, they're processing data. So it sounds like you're not the only one. Again, I wouldn't worry about it. There's nothing you can do about it anyway, all you can do it make more content and wait for the data to catch up.