I am having the same issue as well. I took a look at the page source for my test profile, copied the URI and pasted it a web browser. In Safari it gives me a broken image icon, in Firefox it says:
The image “http://a3.twimg.com/profile_images/1078824623/ img_normal.png” cannot be displayed, because it contains errors. I downloaded the image using curl and the contents of the PNG is actually XML! With an error code "AccessDenied": <?xml version="1.0" encoding="UTF-8"?> <Error><Code>AccessDenied</Code><Message>Access Denied</ Message><RequestId>3B8A35B427C2CFA3</RequestId><HostId>SfeZ +c4cndtXGQucKuGtYvKrtteoLapRJojZEW9nWae20FMOy2IA/D7jeZowOKMh</HostId></ Error> The plot thickens?
