As your second post is not visible here is the answer that i got:

Hello,

Welcome to the LabKey Environment!

A user shouldn't have to be a "Site Admin" in order to edit a wiki page, could you try giving the users editor rights to the project in question.

I am a bit confused by the error you got (below). This usually means that there is an issue with the HTML in that wiki, and doesn't really have to do with permissions. Also what did you mean by normal editor/advanced editor, could you send a screenshot of the editors you are looking at?

Illegal attribute 'onclick' on element <a>.

Configuration of your virtual environment looks good.

Thanks,
Chet