Some users who have installed OS X 10.10.1 experience problems with Safari and Youtube.
The error occurred after updating to OS X 10.10.1. The flaw exists in Safari and not in Chrome and Firefox.
Have you experienced a problem with Safari and YouTube on OS X 10.10.1, so we want to hear from you.
Comment below and read otherwise much more via Apple .
A workaround is to go into the menu Developer and select a different browser in the user agent.