jwal, I can confirm that.
I've noticed that for quite a while on my Opera Personal Bar / Bookmark Bar.
All the other Shortcuts that I have up there display their respective Favicons correctly.
Only avast's Favicon doesn't display.
It used to on earlier Opera versions. By now I have forgotten at what point the avast Favicon stopped displaying. I assumed the problem was on avast's end since it's the only one that won't display. But, I don't know for sure whether the problem IS on avast's end or Opera's end.