[bug] Messages and calls cover are not displayed when minimized at first place

I experience a weird behaviour of the messages and calls applications when minimized: When minimized to the first position (upper left), the covers appear with no content (just black). As soon as any other app is minimized and calls or messages are shifted to the right (or below), the content is displayed again. Can anyone confirm this? Thanks! vs. [20150226202350.jpg](/upfiles/14249787036759442.jpg) vs. [20150226202337.jpg](/upfiles/14249789289805049.jpg)