I have checked couple of site.. neither on DP plus not even on my blog (check signature) adsense isn't showing??? what about you??
check any other site which has adsense ads... http://www.contestblogger.com/forum/ it is there nowhere.....??????????
I cannot... used firefox and IE both... is this system specific problem?? cannot see adsense ads for any. Not even DP..??
I see ads every where no problem. Looks like some thing is wrong with your PC. Or may be your internet connection. I once had a internet connection from a new ISP, they had a proxy server and they use to show their own ads instead of adsense or any other ads. Try clearing your cookies.