I had same issue with one my blog. First it took the ad place and later when I change the content.. pooooof..! the ad was gone, and I tried but no results..
and then I use ad text link which is working fine for me.
yes...probably they didn't like the content on your forum and also if its is monitored properly or not..
isn't there any other program like adsense which works on same principles and also pays you well??
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Shane
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