troubles with QPainter

[halmassi]

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

Error: RenderBadGlyphSet (invalid GlyphSet parameter) 171
  Extension:    154 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0

Error: RenderBadGlyphSet (invalid GlyphSet parameter) 171
  Extension:    154 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  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:

Widget can  only be painted by one painter at the same time

Widget can  only be painted by one painter at the same time

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Than you to give me your opignon

[spirit]

it's hard to suggest something without seeing a code. can you provide small project which reproduces the problem?