[xwiki-users] Missing user in "List of Users"

Hi all, A problem I've had for a long time, but never tried to fixed ... (with XE 3.5, but maybe since previous versions also) I have an XClass with a field of type "List of Users". I create objects from this class, and the pick list is ok, and lists users defined in my wiki ... Except me. So I tried to check some things about my profile page (but it seems ok). If I go to Admin/Groups, I am properly listed in XWikiAllGroup. If I go to Admin/Users, then ... I'm not there (well, my profile). I don't know what could explain that ... I know I should migrate to 4.x, but meanwhile, it's a bit annoying ;-) BR, Jeremie