Hi,
I have a request that please try to start different options in the Ad size.
i) standard sizes (468X60), (728X90), (120X600), (160X600) etc.
ii) Custom sizes (400X300), (200X50), or anything (if possible)
iii) Graphical Ads or Banners.
iv) Intellitext.
v) Interstitials.
It'll help you...