After updating to Parse.iOS 1.6, calling ParseUser.CurrentUser causes 10-30 seconds deadlock on first call - I can't do anything, UI doesn't respond even when I call this in background. After 10-30 seconds it returns null which is right (I'm not and was not logged in, clear installation).

I suppose it doesn't matter, but: I am calling this in UIViewController's ViewWillAppear() method. This controller is one of 3 tabs of UITabBarController. The UIViewController is first controller showed after app launch.

Downgrading to Parse.iOS 1.5.5 solved the issue.