Sorry, maybe this issue is already covered somewhere else, but doing a quick search revealed nothing. It seems that Avast 11.3 (45420) 15110902 is blocking YouTube on my Mac running El Capitan. Safari shows the message "Could not establish secure connection". Turning off Webshield and restarting Safari solves the issue. When running Chrome, Webshield would not interfere when accessing YouTube. Any ideas?
