My Beoplay app used to work, but suddenly not anymore - any idea?

For about 3 years have I successfully used the Beoplayer app on my 3S IPhone.

Byt recently (2-3 weeks) it does not work anymore - whenever I start it up and want to select my favorit program it fails to open but returns to the Iphone main screen. I did remove it and re-purchased it. But same problem.

Any good idea ?