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Any blacklist would apply to the whole account.

The first time the banner appear in index.html too:
https://i.imgur.com/YGDPBdHm.png

Try to add on url "index.html" or "www" or both: sometimes...

The banners work in your account, the problem seems to be in your layout but we don't know what is wrong.
Try modifying something, for example use this page:
...

This is a very strange problem!
I can't see the banner here: http://estevao.altervista.org/teste.html
You shouldn't use iframe because you eran less.

I investigated without solution. I asked the...

It seems the 728X90 banner doesn't working. Can you try to use the 300X250 code in index.html?

What happen if you use 728X90 banner in other pages?

Bye!