To restore animated thumbnail previews, requires inline video previews to be disabled in your YouTube user settings. Note: not Greasemonkey compatible. v3 Add fix for new youtube update to sidebar vids; remove carousel fallback.
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I see you are correct about the sidebar stopped working. It looks like some Youtube website changes have caused it. If one turns on video previews in the user settings then the animated thumbnails come back for the sidebar but then you also have the inline video style previews on the homepage which we want to avoid. I should be able to get a fix working for this but probably not until next week.
Thanks for the update. In the meanwhile, the subscriptions and home pages have also stopped animating, with video previews disabled now it doesn't work anywhere, and with video previews enabled it works on the sidebar, but on the subscriptions and home pages it's the inline video previews.
It's still working for me with the homepage and subscription page (with video previews disabled in youtube user settings) so perhaps double check the script is still enabled, but if you're still affected maybe Youtube is doing another experiment on some user accounts.
Script is definitely enabled, seems to be some new A/B testing, I could describe it but I don't think that'll provide enough info to pre-patch it lol. It's very similar to how the new sidebars are, so it'll probably come to all accounts within a couple months tops, (with video previews disabled) when interacting with a video or thumbnail the background, containing the title thumbnail etc, highlights until you let go of your current interaction.
That sucks, and yeah I probably can't pre-patch until I see it on my own account. Although I have just released v3 of the userscript that has a fix for the sidebar, if we are lucky it may do something for your homepage too. Let me know if so.
Thanks for the fix! The sidebar works as intended, but unfortunately it had no effect on the Subscriptions page, though I just noticed that only my Subscriptions page is being A/B tested, so my Home page is still the old version (Before the sidebar and Subscription pages got updated). You can (probably) test which version you're on by seeing if your middle and right click also highlight the selected video background, as I noticed that on the older homepage version, only left click has this interaction, and on the new versions it's left, middle, and right click.
OK, I tried your middle/right click method and both my homepage and subscriptions page are the old/working version. Unfortunately I don't think I can do anything at the moment regarding a fix for your new subscription page, if/when it gets rolled out to my account I will be able to investigate the possibility of a fix then (no guarantees a fix is even possible, at some point I'm expecting a permanently breaking youtube change, sort of surprised the fixes have lasted this long tbh).
Seems to be broken again.
The home and subscriptions pages work fine, but the sidebar recommendations next to videos don't animate anymore.