Hi All,
Sorry for not getting back with an update to this.
So..it turns out that the screen scaling (on a 4k monitor) was the issue.
Sketchup needs to launch on a screen that is scaled to no more than 175%...150% is best.
Once it launches...the screen can be scaled back to a high percent.
Im my case...with a 17" 4K built-in display on my Dell Precision, the proper scaling is 250% for Windows 10.
- set screen scaling to 150%
- open sketchup
- change screen scaling back to 250%....all the menues now function.
Sketchup Support will likely issue a patch for this...or at least now they know how to advice others.