Default BubbleUPNP doesnt start to play video

Hi everyone,

just installed my sweet new chromecast, but running into a few problems,,

I've installed bubbleupnp on my Windows 8.1 and also on my nexus 5. I can browse the library on my pc (allthough I haven't quite figured out how to include or exclude some folders) and I can also click to play the files on my nexus 5. The nthe BubbleUPNP screen on my TV (via chromecast) does load....but I can't see any picture of the video and the video doesn't start playing.

Does anyone know the solution to this`?