I updated my spotify to version 2.1.0 on the 8th Dec on my iphone 5 (I am on version iOS 8.1.2).
Since i updated when I try to open the app it pops up in a black screen and then shuts off.
It does this no matter how many times i try to open the app.
There is no error message or anything like that.
Never had an issue before this update to 2.1.0 (2.0.0 worked fine)