wiki immutable page

[Hannie Dumoleyn <lafeber-dumoleyn2 zonnet nl>]

Hi,
I do not know if this is the right place to ask, but does anyone know 
why it is impossible for me to edit any page on our wiki, wiki.gnome.org?
I have had a button "Edit" at the bottom of each page, but now I only 
see "Immutable page" and no Edit button. I have not made any changes 
lately as far as I know. I am logged in. At the top of the page I see this:
Home RecentChanges Schedule Hannie (wiki name) Settings Logout
I tried to logout and login again, but to no avail.
When I go to Settings > Preferences I see, among other things, my wiki 
name and email address, but even my own wiki page cannot be edited by me 
(immutable page).
My wiki name is shown in the Known homepages list in the category for 
WikiHomePages.
Any help would be welcome. I want to start a wiki page for Gnome Dutch 
Translators, but this is not possible at the moment.
Thanks,
Hannie