This site is being deprecated.
Please see the official X‑Plane Support page for help.
It could be the issue--perhaps the graphic settings are too high? The spinning wheel usually means something is taking a long time to load. Other culprits could be custom scenery, planes, addons, etc.
I would try setting the graphics to all minimum settings and then increasing them slowly and methodically per this video until you start seeing problems again.
This site is no longer being actively maintained.