Recently a few people have had problems logging into YouTube with YouTube Anywhere , MyTube repository and the YouTube submission.
Google does its best to detect unusual looking activity occurring in your account. If you use master account authentication, in Google’s eyes a previously unknown web application (Moodle + YouTube plugin) will seem to be authenticating with your account. YouTube may block this as suspicious activity.. There are a number of circumstances and weights to Google flagging it as suspicious, so it is hard to say exactly what will cause an account to be flagged. But when this happens you will get an error message inside the Youtube Plugin that looks like this:
In this case you will need to set up an application specific password for your YouTube account.