Jtag wont boot dashboard on xbox live?!

okay so i updated my jtag to the latest dashboard today, And also updated on my jtag(Avatar update) but now whenever i try to sign in, it just says fatal crash and keeps saying that till i sign out and it will go back to the avatar sign in? i dident update dashlaunch yet, im pree sure i have the latest one, but ya everything else works when im offline but when im on xbox live it keeps saying fatal crash(Im also running on xblse) Can someone please help i just got a kv thanks se7ensins