That's odd. Could you try clearing your browsers' cache and cookies to see if that makes a difference? Here's how: https://goo.gl/W7d54C . Also try Incognito/Private browsing mode. Let us know if this helps.
Thanks for submitting the feedback. To confirm, have you tried using a different device to see if you're still having issues with adding videos to playlist? Also, make sure the device/browsers are updated to the latest version. Keep us posted.
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