[xwiki-users] Strange behaviour when creating new pages => new spaces are created instead (xwiki 7.2)

Hello, I'm running a fresh 7.2 XWiki install (RHEL 7, tomcat 7, postgreSQL 9.1) and I'm experiencing strange behaviour when I try to create new pages in a given space. If I use the big "+" sign on the top of the page in the space I want, the result is always the same : a new space is created instead of a new page. This is not a "parenting" problem, the space in question is indeed child of the parent space. I can try to change the location of the page in the "Location in the page hierarchy where this new page will be created." menu But it doesn't appear in the page list of the space, and it appears in the list of all the spaces. The template doesn't seem to be the problem (Page Type). I can use a page template or a blank page (default choice) in the page type. The only workaround that I found is to create a new page through the space WYSIWIG editor. I edit the home page of the space, then in the WYSIWIG editor I click on "Link" and then "XWiki Page". This way a link to a new unknown page is created in the space, and then and only then can I create a page inside the space. This doesn't seem normal. Can someone give me some insights on what might cause this ? Regards, Denis GERMAIN