Not working with Nightly v. 21 as of ca. 10 Feb Bewertet mit 5 von 5 Sternen

I've used this great add-on with no problem for years, but some recent changes to the Nightly (v.21 beginning about 10 Feb) have apparently broken something.

When the mouse is at the very left border of the monitor, it works as expected. When it's to the right of the site's main text, it works sometimes.

However, on sites including EBay.de, Spiegel.de, the BBC, and many others, when the mouse is in the middle of the monitor or anywhere over the main text section of the site, there is no vertical scrolling at all.

I'm using an identical Logitech mouse with the same driver on another computer using Aurora, and here everything is fine.

Diese Bewertung wurde für eine vorherige Version des Add-ons (0.45.6.20100202.1) abgegeben. 

Thank you. I'll look into it.