Hello Mr. Jinx - absolutely fantastic, it works.
You can fix this yourself by copying styles/default/xenforo/connect_sprite.png to styles/xf2/xenforo/connect_sprite.pngstyles/xf2/xenforo/connect_sprite.png is missing in the archive. This is needed if you enable social login.
If I remember correctly they are font awesome icons and have their own settings.Can anyone explain to me why these standard icons overlap, even though they are no longer available in Style 2.0 Theme 2.1? I had deactivated the file node-sprite. png and replaced it with forum-old. gif and forum-new. gif and changed the entries in the Style - Nodes. I'm facing a mystery.