[Plugin: Really simple Facebook Twitter share buttons] Facebook Like button not

Hello,

It seems the Facebook Like button isn’t working. (other buttons, Twitter etc, do work).
When you click the like-button the number 1 (testing with article whiwh has no likes), but immediatly disappears again. Not has been liked on facebook. When you refresh the page, you see 0 again, and nothing has been added to the facebook wall.

Does anyone else have this problem, could it be a bug in the plugin?