See "to enable OpenGL sinks" here: 

http://sdrblog.wordpress.com/gnuradio-installation/ 

You'll use "style=nongl", instead of "style=auto" or "style=gl" 

On 2014-12-18 14:25, Richard Bell wrote: 

> Yes I'm using Unity. I forgot to mention my hardware, which is an N210 with 
> WBX daughterboard. 
> 
> I'm not sure how to make the style change like you mentioned. 
> 
> On Thu, Dec 18, 2014 at 10:54 AM, Martin Braun <[email protected]> 
> wrote: 
> 
>> On 12/18/2014 07:39 PM, Richard Bell wrote:
>>> I'm using Ubuntu 14.04, UHD_003.008.00-18-g864f84b5 and GNU Radio 3.7.6
>>> 
>>> Whenever I start uhd_fft from a command line, the window opens and
>>> starts to plot. After about a second, the window goes into not
>>> responding mode, where it greys out and you can't click anything. Does
>>> anyone know what could be causing this behaviour? Is it a local setting
>>> of mine?
>> 
>> Are you using Ubuntu's unity?
>> 
>> It might be a GL issue. Try if setting style = nongl will help.
>> 
>> M
>> 
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> 
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