Tvheadend

Hi!
I have installed the latest unstable (3.9.1879~g94ff39d~wheezy) using apt on my Rasbian PI.
For all I can see the TV card (Realtek RTL2832 (DVB-T) : DVB-T #0) is found correctly and I´ve added networks/muxes and channels.
EPG is also working.
Problem is that I can´t watch anything.

Both Play in the channel list and the "Watch TV" gives me a black screen/Unknown error.
I´ve tried the different profiles but same problem; Black screen then in log:"There seems to be a problem with the live update feed from TVHeadend. Trying to reconnect..." and TVHeadend stops and needs to be restarted from init.d.
I tried to copy the url to VLC but same thing.

Reason I need to use unstable is that I planned to have Plex as front-end and the plugin requires some new features from 3.9.

EDIT: Installed latest stable instead (3.4~wheezy), same thing: Channels, EPG appears just fine but I´m not able to play anything. Could it be something with the TV-card after all? Or maybe the signal is too weak?

EDIT2: OK, I don´t know why but suddenly it started to work on 3.4. I´ll try to install 3.9 again.

EDIT3: 3.9 is no go, play gives me a black screen and then crashes TVHeadend.

Anyone got any ideas on how to solve this?

Thanks