When tags are switched off, they can still be selected in the search page.

Tags cannot be switched off.

Okay, I meant the tag cloud. Anyway, I can live with it

When installing two MLF2s on the same site (directory ../forum1 and ../forum2), the cookies interfere with each other.

Yes, in this case you have to edit "session_prefix" in the advanced settings.

Thanks, I tried it and it looks the problem is solved!

Should normal users also be allowed to enter tags with their messages?

No, tags should only be used for important/special/good postings. For all other postings is the full text search.

oh, you mean that when a moderator or admin finds a posting interesting for the community to he can add tags to the message? I understand...

Otto