3.5 upgrade The page isn't redirecting properly

I get this error after publishing a post i can write the post the post shows up on my site but when u click read more it has this error :

The page isn’t redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

This problem can sometimes be caused by disabling or refusing to accept
cookies.

All other post are fine all started once i had upgraded to 3.5
any help would be great i have turned off the plugins and redone one by one still nothing
cheers Colin