I have never seen the spinning clouds, but here is the fix:
http://www.prepar3d.com/forum-5/topic/fix-for-cloud-issues-in-2-4/
http://www.prepar3d.com/forum-5/topic/fix-for-cloud-issues-in-2-4/
Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.