I have a CentOS 7.6 server where I login using xrdp, which works fine. However, I have one particular software where the screen stays black. I found that this is an OpenGL issue. The screen is visible as long as the window is scrolled or moved, but noth otherwise. I tried to diagnose OpenGL problems using glxgears and glxspheres, but these both works fine. I also connected via ssh -X to the server from another computer (where I am logged in via RDP!) and let the particular program run using vglrun, but this didn't work at all - it tells me cannot open display :0. How should I proceed to find the problem, and is it in general possible to use OpenGL via RDP?

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