Posted by An Other on 27/03/2020 14:36:17:
Do people only read the last post in these threads or what? Several people have noted that disabling Adblocker has no effect – the problem is still there, yet people make definitive statements that the problem is due to Adblocker.
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Well, it appears my post wasn't read too carefully! On my machine I recreated the problem by disabling AdBlockPlus. But I also said 'Being on Linux, I'm controlling these things with browser settings. Windows users may find adblocking is being done by their Anti-virus software; most AVM packages have 'web protection' features.'
To be clear, many different security packages include advert blocking features. There isn't a single simple answer that works for everyone. You have to check what's on your machine. It's perfectly possible to have two or more ad-blocking applications active at the same time, and it may be necessary to turn them all off before adverts appear.
Michael mentions Javascript blocking, another possibility. Good suggestion except in this particular case I don't think the M-DRO advert uses Javascript. (Might be wrong; I'm not sure how the ad changes.)
Where adverts come from is security relevant, and how they are dealt varies between installations.
1. The top banner and first ArcEuro ad are from 'servedbyadbutler.com', and use Javascript.
2. The M-DRO advert is from 'www.machine-dro.co.uk'
3. The adverts in the side-banner are hosted by this forum.
Category 3 adverts are the most trustworthy from a security point of view. Most ad-blockers automatically allow them because they're part of the website of interest.
Category 2 adverts are less trustworthy because they depend on a third party who might be tracking or dispensing irrelevant material or malware. In this example, M-DRO is clean. An ad-blocker is likely to take these out unless told not to; suspicion is enough.
Category 1 adverts are very likely to get walloped by an ad-blocker, anti-tracking or other security package because they definitely are tracking, can be abused, and contain Javascript. ( adbutler on Model Engineering Forum is certainly benign, but the same can't be said of other websites.)
Ad-blockers also use different blacklists of websites and web domains known to be dispensing undesirable material. None of the ads on the forum are blacklisted, unless it's been done locally by you. (Unlikely)
Hope that makes sense! If missing adverts are a concern, check all your security settings.
Dave