YouTube Error
Currently all conversions will fail due to YouTube’s current unavailability. All video pages return a “502 Server Error”. We are pretty sure that YouTube will fix this issue soon. Once they fixed it we will start cleaning up all faulty conversions. This will need several hours so don’t be astonished if you see an increased error rate.

Update: Everything is back to normal. We have removed all faulty conversions from our system.
Update 2 (4:46AM PDT): YouTube is throwing errors again.
Update 3 (5:03AM PDT): Conversions work again. We have a slightly increased error rate at the moment.
Update 4 (10:09AM PDT): High error rate again. According to Google Trends this seems to be a global issue. “YouTube down” is a “Hot Search”.