No more effect on voting button

Hello,

Recently I had to face to a wordpress installation crash during a WP update.
After restoration (DB was not impacted), the new WP core (551) did a patch on the Database (seems to be ok).
The idea factory plugin seems to work (submitting idea is doing well), but no way to vote for it anymore.
I uninstall the plugin and resintall ; same effect (note ; the Idea database were not removed by the uninstall process)

any idea ?

Kind regards
Alexandra