Just to keep others informed, today we again tried to startup MSFS2020 and it again stalled out on the splash screen! Now since the software will not timeout on a loading exception, but Will continue to do something, you have to guess at the problem. Windows 10 update will show you a list of drivers that may be causing the startup issue (Win 7 can why not MSFS2020). Again Windows 10 indicated that the Saitek driver was not up to date, as it did 3 days ago. So we updated the driver and again MSFS2020 started up and there were no adverse problems with the Citation this time.
Three times we have had this loading problem where the first was a Windows 10 update that fixed it. The last two times were drivers associated with hardware used with the sim. When you see this busy circle at the lower right of your screen continue, it becomes very Uncomfortable because you do not know if you will recover, meaning many more hours of troubleshooting, again, and again! The developers software should timeout with some exception indicating something like an error code.