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I'm having a related issue. I do have the apache mod_sec installed...
However, one XOOPS site has a Google Adsense ad which shows up in a custom block that I call "advertisement"
This has been working for quite some time with no issues.
I'm building a new website, which has an "advertisement" block on the left column, and an "advertisement" block on the right column.
On the index of the website, both ads show properly. However, if I click on any of the sections (modules) of the website, the right column ad doesn't show at all.
I can view source and see that the ad code is there, but the block is blank (not showing the ad).
I wonder, would a block be considered a frame? When generating the adsense code, it asks whether the code will be placed in a frame. I've chosen no to this option.
Thanks in advance for any pointers/tips.