YouTube is currently experimenting with server-side ad injection. This means that the ad is being added directly into the video stream.
This breaks sponsorblock since now all timestamps are offset by the ad times.
For now, I set up the server to detect when someone is submitting from a browser with this happening and rejecting the submission to prevent the database from getting filled with incorrect submissions.
Do you use Firefox?
because Google intentionally nerfs loading performance on any non-Chrome browsers.
I usually find if startup buffering takes more than 2-3 seconds on my home Internet, just refreshing the page magically makes it go away.
Yeah Firefox + Ublock Origin. It buffers for me indefinitely and the only way to fix it is to skip ahead 10 or so seconds. If I then go back 10 seconds it starts buffering again.