Google AdWords HELP! I don't understand?

Question: Ok.. here's my situation:
I'm promoting a site on ClickBank about Weight Loss
It was doing well.. the CPC is good, the Keywords are perfect, the ad was good.. it was getting alot of page impressions and clicks, well we started changing the ad.. JUST THE AD HEADLINE AND SUBLINES! Nothing Else!
Now the ad isn't displaying.. I mean it displays in my Campaign Summary but it has no Page IMpressions or clicks now.. why is this? I just don't get it.. It was doing well then all of a sudden stopped.. and no, it's not my daily budget, I haven't even gotten to half of my budget yet.

any help would be greatly appreciated,
Corey Geer

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Heres a great tutorial which also lists great resources

http://lifeonthewww.com/06/19/getting-st...

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