[Paraview] bug in v4.1

[Weiguang Guan]

Version: Paraview 4.1.0 64-bit on Windows
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:

ERROR: In 
C:\DBD\pvs-x64\paraview\src\paraview\VTK\Rendering\OpenGL\vtkOpenGLRenderer.cxx, 
line 1068

vtkOpenGLRenderer (000000000B2CDC50): failed after RenderPeel 1 OpenGL 
errors detected

0 : (1282) Invalid operation


whenever it refreshes the display, even though the opacity is 
effectively changed.

Weiguang
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