Sorry, I should have noted that I'm talking about Ad Injection widgets, if that matters any...I'm using Adblock Plus (sorry again: I'd misspelled the extension's name) with the Opera browser on two machines: one doesn't display the Ad Injection widget titles at all and consistently ignores the whole widget (not even their titles can be seen) while the other only displays the Alt Content Pool ad units on occasion.
I've now also noticed the same problems using Adblock Plus on Firefox and Chrome.
Adblock Plus doesn't provide any logs, though there's an extension to the extension that does...I'll run that as a last resort (hate getting all "technical"!) -- but as per your other suggestion, I did check the webpage source codes in all the affected browsers and discovered that in Opera the Alt Content Pool height and width had been set to 1 pixel both!! So I went into my Ad Injection widgets and made sure every one had the proper height and width -- but Opera, Firefox, and Chrome are still not displaying the Alt Content Pool images (hosted on my own site), despite the page source now properly listing them!
One thing I also noticed...I use XHTML protocol in making sure that <IMG> is closed ("
<IMG />"...with a forward slash) but the browsers' page source codes render standard HTML ("
<IMG>"...without a closing forward slash) -- does that matter any? That's the only difference I can find....
Maybe the Adblock Plus extension is just really "smart" and has been written to detect words like "ad" and "ad injection" in the HTML???
Sorry for the lengthy reply; I hope you can make sense of things and come up with some ideas as to what's going on -- 'cause I'm out of them myself!!