Try these first
Try purging browser cache and all cookies.
Disable any other extensions that modify YouTube in any way.
Try these next
Still showing “unregistered” after subscribing
Please try disabling and re-enabling the extension to resolve this issue.
If that does not help, try removing your email registration address, hitting return, re-enter your registration email address, hit return.
Please remember that your registration email address is case-sensitive and not necessarily the same as your PayPal email address.
After that, please contact support with your PayPal “Automatic Profile ID” (it should look something like “I-1WW2XX3YY4ZZ”).
YouTube performance is stuttering, stopping, slow or otherwise sub-standard
This is not an issue with Options, but we’ve gathered some info and suggestions that should help improve performance.
YouTube panoramic (360-degree) videos are not playing correctly
Make sure the the Video codec option is set to “HTML5”.
YouTube audio doubling up
We have found that to be a browser bug. Purging browser cache and all cookies has helped some users.
The “Full version” has been disabled by Google Chrome
Video downloads are not working
Here are some suggestions and additional information that may help.
You want MP3 downloads
Sorry, we don’t offer that. Here’s why.
Looking to get a license
Looking to cancel a license
You should do that using your PayPal account. You can also read about your subscription on the Subscription information page. If you are unable to do it using your PayPal account, please make sure to send us your PayPal “Automatic Profile ID” (it should look something like “I-1WW2XX3YY4ZZ”).