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[Discuss-gnuradio] GRC not responding?

From: Gerard F6EEQ
Subject: [Discuss-gnuradio] GRC not responding?
Date: Sat, 5 Dec 2015 11:06:58 +0100
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

I'm new to GNURadio (and to Linux), and I try to understand how it works.
I use the tutorials from GNU site and from ETTUS which are quite simple to begin.

However, I have some problems: I cannot save the flow-chart nor execute it.
When I start GRC and save the first screen (only variable + option squares) it's OK. Then I enter a simple sketch (signal source + slider + throttle + FFT sink) and it's impossible to save or to execute. There are no apparent error (all is black and the STOP sign is not on) and I counter-checked dozen of times, directly and against similar tutorials.

No error arise during saving and execute phases, but nothing happens.

It's probably something completely obvious, but I cannot figure what.
It worked and suddenly did not work!
Any hint would be welcome!

I use version 3.7.5 (this is the one which has been automatically installed with "apt-get install").
OS is the last DEBIAN with KDE desk.

Have all a nice WE.

73 de Gerard, F6EEQ
UFT 270, REF 27177, RCWC 257

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