Can not edit profiles from the update Joomla 2.5.16 and CB 1.9.1

I made the updates to Joomla 2.5.16 and CB 1.9.1.
Since I am unable to change the site's users in front and back end, even in the super-user. When I make a change in an empty window appears with OK.



If I validate with OK, you return to the profile without modification.
I can only edit my profile. I can also change the portraits.
Do you have a solution?
Thank you for your help,

The same problem has found a solution in the following message:
www.joomlapolis.com/forum/146-general/223448-joomla-2516-and-cb-191-issue#236908
A specific error message (instead of a white window) to avoid would be nice to find a solution too long.
Sincerly,