Yes i made several reset, exclusions, inclusions, vera reset and clear EPROM but nothing worked...
I made a new sensor and it works perfectly
Strange... I will try again when i will have more time.
Thanks for the help
@cheesepower
For vera-specific questions you should considering checking out the micasaverde forum first, you may find your answer there!
Also, I would recommend PLEG plugin if you have any advanced logic you'd like to program (PLEG is better than the default Vera interface IMO, but I still wish there was a more intuitive interface that would allow you to program your vera like you do the arduino)