J'ai eu leur réponse
Hello Claude,
Thank you for taking the time to contact us. We see that you do have "Participate in Beta Testing" checked in your profile. Receiving Beta work units is just a matter of chance. Your computer must be requesting work units when the Beta work units are released. Hope that helps.
Thank you for participating!
World Community Grid Support Team
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World Community Grid
En clair , il faut de la chance et moi j'en ai pas