I'm new to Sweet Home 3D (2 days) but not new to IT (At least 40 years).

Two days ago I downloaded to Source Forge version and liked it so I then paid for and downloaded the Windows App version.

I'm running:
Windows 10: Home (x64) Version 2009 (build 19042.1415)
Sweet Home: 3D 6.6.1.0.

The Problem:
I cannot CLOSE or EXIT SH3D. I have to use the Windows Task Manager to close the App. On restart I don't get my saved file(s) fully back.

Things I have done:
I can find nothing on this forum or in the FAQs.

I have tried the Windows App Management Repair, Reset and Uninstall, then reinstalled. I have cleaned up my registry and all sorts of junk files but the issue persists. I have rebooted my PC. I have done all this twice.

Can anyone offer any idea as to what the problem may be.

Thanks in anticipation.

Seth REEDER.