Edit: believe it or not, we got more complaints about this. Some people picked their top color specifically to go nicely with the orange Y! So I've reverted this change, except for the Christmas case. Users who have set their topcolor don't see the Christmas top bar anyhow, so don't have to worry.
However, there was a brief period where we were serving the transparent Y for favicons before I noticed that and corrected it; I wonder if the transparent Y somehow got into a cache? Is there a way to force-refresh?
I think the problem might be that NetNewsWire doesn't support SVG favicons (/y18.svg) and that /favicon.ico isn't available as a fallback. Were there any changes regarding these files recently?
What do I need to do to make /favicon.ico available as a fallback?
So this really did break my workflow, hah