Multiple sudden issues after latest Lightroom Classic update

For no obvious reason, since the start of the year (2025) my version of  lightroom classic has suddenly developed numerous bugs/issues that render it almost unusable. Not sure exactly when it happened, but may have been after most the recent auto-update (LR v.14.11) around Christmas time. Also perhaps relevant, I had also recently upgraded my laptop from Windos 10 to Windows 11. I will probably discover more bugs, but so far;

• For my entire historical catalogue (9000+ files)  it seems any editing changes (exposure, crop etc etc)  have been lost and only the original raw image is available. Images imported and processed AFTER  developing the various bugs, do keep the editing changes:
• Keyword list has mysteriously disappeared making it very difficult to find photos : The Keyword list panel is visible but there is no list  - simply a box reading “Filter keywords” with options “all, people, other”
• Topaz denoise AI plug-in no longer works from the  edit-in drop down menu (the menu of plug-ins incl topaz denoise is displayed by right clicking, but is greyed out and inaccessible). Topaz is up-to-date and fully subscribed.
• I can no longer export images: clicking on the export tab does nothing.
• After exiting the program, LRC won’t launch a second time   without first restarting computer.