Resuming my posts(http://support.stackmob.com/entries/24775522-iOS-SDK-2-0-0-relation..., iOS Stackmob SDK(2.0.0) (relationships) Bug..., https://github.com/stackmob/stackmob-ios-sdk/issues/51).
Everything work perfect within a week. Then something happens on server side and any relationship aren't work via ios SDK. I need to remove schema(for example I can't remove "User" as can be clearly understood) for repair. Or I need to create new account/application for resolving issue. It is subject to the development schemas only(on the production I have no tested).
Crash logs are different. Sometimes like this(http://support.stackmob.com/entries/24775522-iOS-SDK-2-0-0-relation...), sometimes just assembler code, without any descriptions in log.