Hi Sujoy,
I think I have identified the issue which is bound to show up only with certain CPUs under specific circumstances as well as some types of virtual machines.
Could you please try to replace the file d3layer.cc in the sub-directory “viewer” of geoviewer with the following version and recompile it.
In my test setup this resolved the issue but I cannot guarantee because it was very tricky to reproduce the issue you were encountering. Therefore, it would be great if you could try the patch.
@fferrull could you please try as well? In your environment the patch is already installed. So you would just need to start flair and try the 3D view.
Cheers
Chris