I just got the BB Style and after the update I try to set up the BIS with my gmail account and after i enter in the info and hit next it just reloads to the same page. I made sure that my password is correct by logging in on the computer. I tried the Sprint BIS website but it wont let me create an account and says I have to create it on my phone but of course I cannot.
I would suggest calling into technical support from another phone. It sounds to me like the BIS account is setup but is getting stuck somewhere. They should be able to troubleshoot it. It may require deleting the BIS account entirely and recreating it once it is cleared from the phone.