Liightroom classic fail to start after full new install

Problem Statement: 

• LrC hangs up after starting. Does not respond. have to close . 
• ==> impossible to use the program

Next steps done: 

•  remove Lrc entierly using teh Clouds app.
• shut down WIN11 
• restart and insntall again LrC from Adobe cloud. 

Unfortuntaly exactly the same behaviour: LrC loads and is stuck with excact the same screen: Develop module and last edited pictures. will not load.

Conclusion: I am stuck.  very strange indeed. 

Not that I found a security uopdate 2025-11 Security Update (KB5068861) (26200.7171)  isntalled on novembe 12,  and my be the culprit. Has anyone an idea ? 

Any feedback is welcome. thanks... Francois