I am developping a Player, displaying picture by picture using QPainter
When playing, it works normally but I have those console messages

Qt Code: 
  1. Error: RenderBadGlyphSet (invalid GlyphSet parameter) 171
  2.   Extension:    154 (RENDER)
  3.   Minor opcode: 25 (RenderCompositeGlyphs32)
  4.   Resource id:  0x0
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for eache picture I display, using QPainter::drawImage() methode

But in My GUI, I have Buttons and Sliders for some purpose, and a Widget to display pictures (I implemented the QWidget Interface)
SomeTimes, when playing and touching sliders at the same time there is error messages relative to QPainter
Right now I haven't the exact errer messages
But I remember this:
Qt Code: 
  1. Widget can  only be painted by one painter at the same time
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Than you to give me your opignon