Possibly not the extension was updated but maybe a "List" they use to decide which parts to block. Such extensions usually allow to whitelist a domain / page which should solve the issue.

I think some to detect whether an ad blocker is installed, not sure how good it works or how it is done etc. If more users will experience this it might be nice to show a warning that they need to disable ad blocker for this page.

thanks for commenting that fast.
Yes website can be white listed of course.
But since it was NEVER needed before, and lots of people uses this combination of software,
I thought it was worth reporting...
Maybe you are this is only a problem with the current ruleset of the extension....

I expect quite a few users to experience this problem and as mentioned it could be nice to show a warning in such a case. Haven't researched yet if possible and how but I've heard of sites that do detect an adblocker

Update: It looks like there are a couple of ways to do that

We asked them in the past already and their comment was something like that anything that tracks users is evil no matter what (something like that would need to search for email) and they won't remove it. One should be aware that there are companies behind some ad blockers etc that wanna make $$$ by getting $$$ from advertisers to whitelist their ads etc so they don't really care about such cases

just to clarify: I think these are two different cases:

1. this problem is about Piwik backend. This was always working without any problems.. (for years and each single piwik version, even the betas.. always using latest FF and the ad block plus extension)
2. The other thing is the possibility to track websites using piwik.
   This is sometimes / by some add-ons blocked

some more details on this:
The sites

• Admin
• Help and
• user

are working fine

Just noticed it duplicates the issue: #7928 and #5094 - feel free to leave comment on the issues if appropriate