Seems this is a problem of NVIDIA blob(currently your videocard is GeForce 8600GT?) and initializing OpenGL context with custom options, when you use already created window with unknown visualinfo. Try to open XGLDevices.pas and replace line 168 with this one:
here main change is GLX_ALPHA_SIZE, 0Code:GLX_BLUE_SIZE, 8, GLX_ALPHA_SIZE, 0, GLX_DOUBLEBUFFER, GL_TRUE,
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