I'm not sure what else was loading along with my webpages, because the source code could not be read.
Lower than normal click (and conversion) levels the past 3 days for me.
there is a flurry of discussion at the adsense forum regarding adding certain websites to the competitive ad filter (blocklist). is your decline of traffic only on the content network? if so, maybe your site is being blocked by a bunch of adsense publishers.