I was relieved when I saw this thread It's not just me Hehe, joking... Had the same problem! Ads didn't show up, there was just "Your ad here!" I sent them 2 emails, they said that ads will show up in 24h, and of course, they didn't... So I decided to abandon AdBrite...
They don't show ads when users visiting their own site. check it with another computer that you have never log in to your adbrite account. you will see ads.
I have also had this problem with adbrite however i had plenty of adverts on my website until i updated my server and lost every single ad it now displays "your ad here" anybody had the same problem? i have emailed them but they are yet to respond. btw my sites echognetwork.info
it never shows quality ads even once it was showing some fatty girl ads to reduce ad it was looking tooo bad on my website so i removed that and most of the times it never displays ads