Permissions menu for workspace is not shown

Permissions menu for workspace is not shown

I cannot change the permissions on existing workspaces.
I open a workspace en go in the menu to: Workspace->settings: the page that opens is:  "https://wiki.zoho.com/CategorySettings.do?sdomain=wiki.green-consultant.nl&cat=Leeshoek" is blank.
When I go to workspace->settings->permissions the page that opens is: "https://wiki.zoho.com/CategorySettings.do?sdomain=wiki.green-consultant.nl&cat=Leeshoek&t=4" is blank.

So I cannot change the permission setting on workspaces!!

I CAN change permissions on a page or on a Wiki but not on workspaces.

I use safari and tried the same on firefox with the same results.

Please help mee to fix this problem!