Found the apparent error in vBulletin's Google AdSense. Upgraded it yesterday - all seemed well initially but - as seems - not anymore. When switched off, the error vanishes.
This may have something to do with some OpenX work we've done previously - it's the only thing I can think of.
Now we know what seems to trigger this error, do anyone of you know what [other things] may cause it?
I am a bit baffled.
In any case - thanks for your feedback and attention guys - very much appreciated!
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