[Bugs] #4104 sugar UNSP: Screenshot is all black in XO-4

[Sugar Labs Bugs]

#4104: Screenshot is all black in XO-4
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    Reporter:  godiard                    |          Owner:  erikos     
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  sugar                      |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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 (And is not a rugby player)

 TestCase:
 Press Alt-1, go to the Journal and look at the screenshot created, you
 will see a black rectangle.

 Tested in xo-4 and xo-1.75, the error only happens in xo-4.
 Nothing in the log.

 Other instances generate images like the preview associated to a activity,
 or the bookmarks in Browse or Read.

 Is not solved installing pygobject3-3.3.91 (see #4102)

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4104>
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