gazza1934 - 11:30 pm on Jun 2, 2005 (gmt 0)
I am new to this forum so apologies if I get it wrong.
I run several sites and have exactly the same problem. I have a skyscraper on the right. Add another ad block anywhere and that one disappears.
The pages are content heavy - more than 1,000 words each - and deal with travel places which attract heavy destination-specific advertising. Depending on the search term you use some of the pages have the top ranking in Google.
I therefore doubt that the reason the advertisements are not appearing is due to a lack of attraction. It something I have screwed up in coding the pages - I am not a total beginner but close.
The link provided in an earlier answer clarifies the Google position on this - it is all for multiple ads up to a maximum of three on a site - but it does not address my problem. Any suggestions, advice, pointers received with pathetic gratitude. I have been struggling with this for weeks.