white tiles after "No HTTP answer" exception

Discussion created by dolan... on Jun 4, 2013
After sitting idle for an extended period - I believe it was long enough to cause token refresh, I've seen the GenerateCredentialAsync() callback (Action<Credential, Exception>) made with Exception = "No HTTP answer".  After that, I got white tiles when panning to a new region.

Is there a 'best way' to try to get the IdentityManager to refresh the token after this has occurred?