When a student goes from his wiki to another visible group, the edit tab in the other group's wiki is displayed.
- Clicking on it gives (correctly) an error message that they cannot edit the other group's wiki.
- Refreshing the page does not display the edit tab.
This also occurs the other way round. When a user views another group's wiki, there is no edit tab. When they go to their own wiki, there is also no edit tab ... until they refresh the page and then the edit tab appears.
I found an old post in the tracker (mdl2.2, I think) that had been fixed, but could not find a more recent occurrence of this issue.