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Version: Paraview 4.1.0 64-bit on Windows<br>
Recipe to reproduce the bug: (1) Sources->Cone; (2) Change
opacity by moving the slider. A window will pop up, and it keeps
printing message:<br>
<br>
<span style=" font-family:'Courier'; font-size:8.25pt;
color:#800000;">ERROR: In
C:\DBD\pvs-x64\paraview\src\paraview\VTK\Rendering\OpenGL\vtkOpenGLRenderer.cxx,
line 1068</span>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span
style=" font-family:'Courier'; font-size:8.25pt; color:#800000;">vtkOpenGLRenderer
(000000000B2CDC50): failed after RenderPeel 1 OpenGL errors
detected</span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span
style=" font-family:'Courier'; font-size:8.25pt; color:#800000;">
0 : (1282) Invalid operation</span></p>
<p style="-qt-paragraph-type:empty; margin-top:0px;
margin-bottom:0px; margin-left:0px; margin-right:0px;
-qt-block-indent:0; text-indent:0px; font-family:'Courier';
font-size:8.25pt; color:#800000;"><br>
</p>
whenever it refreshes the display, even though the opacity is
effectively changed.<br>
<br>
Weiguang
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