So yesterday ended up being even worse than the black days of summer. Traffic normal (most comes directly from Google searches) but EPC way down over multiple sectors.
Looks like I've been SnafuPriced but I can't think of anything I've changed to cause that. And of course the Adsense black box gives no indication of what's really happening, so there's nothing I can do to fix it.
If it wasn't for the recession attacking my other income streams I'd have ditched Adsense by now.