On YouTube webpage, instead of the video thumbnail images, I see only a blue box with a question mark in it. Any video on YouTube does not seems to work either. Can anyone help me? I am not able to find a proper way to solve this error.

Last action performed before encountering the issue: Installing Unity 2018.3 (it is working fine)

I have a mid 2010 13" MacBook Pro running macOS High Sierra 10.13.6

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  • Try the following one by one: 1. Open YouTube in a private tab 2. Try clearing browser cache. 3. Try opening YouTube in a different web browser. – Nimesh Neema Jan 25 at 10:12
  • I am a pretty new mac user. How can I clear browser cache? It works if I simply delete history? – Catalin Catalin Jan 25 at 10:17
  • In the Safari menu bar go to Safari → Preferences → Privacy and clear all cookies. Then in Safari menu bar go to Safari → Clear History.... Do note that this will clear all the browser history for all the websites. – Nimesh Neema Jan 25 at 10:28
  • It does not work at all – Catalin Catalin Jan 25 at 10:32
  • First lets see if it is only a Safari issues, install Google Chrome and visit youtube.com and see if the issue persists. If it does check the "App store" for any Safari related updates. – avi Jan 25 at 12:58

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