Thanks for the answer :) But well, I tried, the only point is that the debug output only gives me warnings about a translation pb, but not about a template missing... Warnings are the same whatever the tab, but my problem only affects content and media tabs.
If I try to turn on the Template debug, I have a (very) (long) list of templates unfound, but it seems to me that none can affects the main area : as far as I can see, it outputs the sames for <i>each</i> tab, not only thus presenting the problem.
Sorry, I'm a newby, so that's probably something very stupid, but I can't figure out what it is... :(
I just had this problem with 3.10 copying a site from a development machine to a live server. Try going to
http://<yoursite>/content/treemenu?node_id=2
If you get an apache error (instead of a blank page) such as:
Your browser sent a request that this server could not understand.
then try rewriting the default rewrite rule as described here: http://ez.no/fr/developer/forum/setup_design/solved_3_10_0_no_tree_structure_items_user_media
RewriteRule index_treemenu.php - [L]
by : RewriteRule content/treemenu/?$ /index_treemenu.php [L]
