[OpenLayers-Users] strange artefacts in overlay layer (mapserver)

[BrainDrain]

I have 2 mapserver layers in my map:
1st (transparent:false):
isBaseLayer:true,alpha:false,singleTile:false,transitionEffect:'resize',buffer:0,gutter:16
2nd: (overlay,transparent:true):
isBaseLayer:false,alpha:false/true,singleTile:false,transitionEffect:'resize',buffer:0,gutter:0
 and I have square artefacts (image tone or opacity/transparency changes)
while paning/zooming map:
IE example:
http://www.nabble.com/file/p19413291/ie.jpg 
and after scrolling down:
http://www.nabble.com/file/p19413291/ie2.jpg 
k-meleon(gecko):
http://www.nabble.com/file/p19413291/k-meleon.jpg 
need help

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