BuddyPress.org

I’m not sure what cause the problem but on two sites that use xprofile field (some just use minimal profil field) when some users try to edit and update their profil, nothing happen: no change and no message.
What makes me confuse is that on one site, I can make change as the administrator. On the other, I can’t. both use the lattest version of Buddypress (1.5.5) and I’ve tried to diseable other plugins for conflict, used the default theme and used the same name for the primary field (Name) and primary set of fields (base).

Any idea someone?