Many Google AdSense publishers who use YouTube to earn their money are reporting that their performance reports in Google AdSense is showing zero earnings. There are hundreds of posts in a YouTube Help thread and not one word from an official Googler.
The reports started coming in two days ago on December 4th. But the complaints have been going on since then and there is no resolution or response from Google.
It can, and hopefully is, a bug or delay in reporting from Google but maybe Google auto-banned a bunch of AdSense partners? It is unclear until Google responds.
There was an earlier bug with YouTube/AdSense publishers where they were being disabled a few months ago.
Do you have this issue?
Forum discussion at YouTube Help.