Over the past couple of weeks, YouTube has been posting messages in the Analytics page about difficulties they are having with the processing of data. I have noticed that they have been up to a week behind in displaying data - they have always been at least a day, sometimes two, behind. This just shows that even YouTube, which has the power of Google behind it, is having difficulty processing the massive amounts of big data that are being accumulated by YouTube on a daily basis.
Here's today's message, and note in the chart the gap in the line for missing data:
Analytics users: We love you. We are just going through a bit of a rough patch. The missing data for the 13th will be restored shortly. It had some irregularities so we temporarily skipped it to get you the rest of your data faster. Thank you for your continued patience.