Hi,
I'll tried to make a backup by exporting the database.
When I import the tables then reactivate the plugin, i seems that emember ignore the content of wp_options table.
I checked manually, and the eMember_configs line is the one i'd like to see into the emember import settings.
Thanks a lot for all the answer you give.
I still think that these 3 plugins are the best i've ever seen.