Anyone who owns an iPhone or knows someone who does.

I downloaded the newest iPhone software (10.5, I think?) and it has crippled my gmail account on the phone. Keeps giving me an error message the the username & password are incorrect. Anyone have or heard of this issue before?
Thanks,
GJ
P.S. Before someone takes the time to post advice of google searching the topic on the net, I already have, and found no relief. Thanks.