[Bugs] #4254 Measure UNSP: Measure's FFT mode broken

[Sugar Labs Bugs]

#4254: Measure's FFT mode broken
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    Reporter:  greenfeld                  |          Owner:  walter     
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  Measure                    |        Version:  0.97.x     
    Severity:  Major                      |       Keywords:  regression 
Distribution:  OLPC                       |   Status_field:  Unconfirmed
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 1. Start Measure and verify you can see audio on the oscilloscope.
  2. Click on the Sine Wave in the top menu to switch to FFT (frequency
 graphing) mode. Nothing will be displayed.
  3. Clicking through various measurement modes eventually will restore the
 original Sine wave, but going back directly does not seem to be possible.

 Seen in OLPC 13.1.0 os12/Measure-42 on XO-1.5 and XO-1.75

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4254>
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