So, you have enabled it for your posts (this means, it's checked as renderer in the bottom right box)?

Yes, ofcourse! :-)

Very strange then. I've actually never used it by myself, but it should work, of course.

Have you tried it at http://demo.b2evolution.net (with the version 9.x variant)?

Thanks for your response!

When I type in [[something]] in the backoffice, I expect that a link to wikipedia will be made. If this is not the case, please correct me.

I just tested that in the testblogs, but it does not seem to work there either.

I've thought "wikimedia" plugin would be a typo.

About which plugin are we talking? The default wikilinks plugin that ships with b2evo (which won't create links to WP, but only to internal pages) or another plugin?

Ah, this makes more sense... The default wiki thing makes links to other pages?

How does that work then? I noticed a question mark within some articles, that opened a "write a new article" panel.

I thought that that was something triggered by another plugin I do not understand: Wacko formatting. (I even tried to switch that one of by changing it to "opt-in" It now is unchecked when I write an article, but when I edit one, the box is checked. Strange).

Wacko is checked for items that you edit, because you had it checked when you've created them: renderers apply post-by-post.

Wacko is just something like that:
=== Title ===
and a few more. The only documentation currently is the source code itself.. :/

Yep, that's how the wiki plugin works: you can link to other posts by [[TitleOfPost]] and if it does not exist, it inserts links to just create them (the question mark). Try creating a missing posts and see the question mark vanishing.. :)

But THAT doesn't work. This means that when I insert something like [[quote of the day]] it will link to a posts titled "quote of the day". But this doesn't happen. Only when I insert it in this way: QuoteOfTheDay or [[QuoteOfTheDay]] it will make such a link, the first case being totally unwanted.

Concerning Wacko: I checked your claim. Yesterday I made a post with the wacko renderer unchecked, now I clicked on the edit button and Wacko Formatting is checked! Strange!