Hi Everyone, I have a USRP N200 rev 2. I created a simple graph using the gnu radio companion (grc) which is composed of three blocks, a UHD source, a variable slider, and a WX FFT Waterfall display. When I run this graph, i quickly see the waterfall display fill up with the color blue and then the application becomes unresponsive. How can I fix this? When I run the uhd_fft tool, it appears to work correctly -- it shows me a spectrum and allows me to adjust the fc and the gain. Also, where can i find a guide to the N200 debug lights? Lights C, E, and F seem to be on all the time. Is this okay? Thanks in advance, Isaac