connection blank page after the login page

[bastia1905]

Hello here I just installed TBDev_2010_revision_464 everything is pass I created the first user is the administrator of the site but when I enter my username and password and I validate it makes me a blank page with a url not normal I think.
Here is my www.myip/TBDEV//login.php?returnto url =% 2F% 2FTBDEV% 2Fmy.php

PS: Iam french sorry my english

[DND]

u need to set it right, if not it won't work