When clicking on SkyGuide links the following (example) is seen:
This XML file does not appear to have any style information associated with it. The document tree is shown below.
User reports solution as follows:
Windows 10, latest updates. It is related to Intel display drivers only. My Dell laptop has a second AMD display controller. After disabling the Intel, the AMD was automatically used, problem over. Redshift has the same problem, but others using opengl not.