Hi,
The Devs are looking into this.
Thanks, I really appreciate that.
FYI I tried disabling every single extension on avast secure browser - both the preinstalled avast ones, and also ones I've added from the Chrome Store. I then cleared the cache & history etc fully and restarted the browser with everything still disabled except for the video downloader extension. It still shows the toolbar icon greyed out and no green bar on YT videos to select the quality and download them. I tried this to eliminate an extension which may have updated between my morning session when the video downloader was working, and my afternoon session when it wasn't. I do know I was on the same latest version of the browser and of the video downloader on both occasions, but wondered if another extension update or a filter list in one of the ad/tracking/ blockers had a new entry that might be interefering. It seems not...
The only other thing I can think of that may have changed between the time it was and wasn't working the other day, is one of the many things listed on the secure://components/ page, but I have no way to check that or to undo anything that got an update. I haven't changed any settings in the browser since is was and wasn't working either. It's a real puzzle!
There would have between virus definition updates for windows defender, but I'd be surprised if it was that. WD does not appear to have blocked or be blocking anything.....