I\'m sorry if it has already been asked, but here comes the problem:
I\'ve recently updated my SDK to iOS 5 beta. My app builds and runs perfectly fine
I had the same problem and just found a solution. My UIActivityIndicator was added into a xib file. I have removed it from the xib and have created it by code (activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:...).
All is ok now, it works !
I hope this will helps you.