Somehow I can't update my apps through the applications manager. Whenever I try to update an app, the download will finish, but when the blue progress bar reaches the end, it just says 'Download failed'.

Any ideas why it's behaving this way?

P.S. I was able update my apps through the Store app, though. But it's a hassle doing this every time.

update over appliction manager for me only works when I have running store in background.