[Discuss-gnuradio] Gnuradio 3.7.2 adn WX GUI Waterfall Sink with only blue screen output

Hi,

Installed Gnuradio 3.7.2 from source. Had some troubles loading files from earlier versions so I started from scratch with the FM receiver from author 2h20. Added a bandpass filter to filter the 19 kHz pilot tone (just for fun) but want to add the waterfall sink to see / show 57 kHz RDS carrier (also for fun / getting experience).

The waterfall sink only shows a blue screen. Tried different range settings, different ref scale settings and FFT sizes. Stole the settings from this example http://www.kj6msg.com/2013/09/gnu-radio-rtl-sdr-and-mac-os-x.html but still no output. The waterfall also shows no scale information or labels.

Found another problem about this on the list where the question was what happened if a signal source was connected to the waterfall sink without anything else, I tried that also but even there only a blue screen is filled but no signal and no labels and so on are showed.

The output window is here: http://www.pe2bz.nl/hamradio/uploads/images/Selectie_001.png

Thanks for any advice,

Ben