Color Grade and Deliver Grade Not Matching

Please take a look see at the attached.
3rd is ungraded.
2nd graded as seen on DR16 color page.
1st is what I get from Deliver output. You can see the blacks are way off (much more noticeable on my display) and unwanted reflections are present in the window. This was easily handled on the color page via Log Shadows/Lift but it is outputting improperly.
In this case DR is not including at least two nodes that handle the blacks immediately behind subject. Looks great on color page, output is off. Such is the case on almost all clips.

I suspect possible tremors in the force: Between this issue and one of my scopes refusing to display when using a 4xgrid, it may be a software corruption. Am I at any risk to uninstall/reinstall? There's more than one way to do that so if you have a rec, please advise.

Most probably issue is your external player that does some ”smart” color management based on wrong interpreration of file metadata. Import your delivery render back to Resolve and compare to timeline to see if there is actually a difference.

Thanks Hendrik.
I reimported the delivery render back into DR. Definitely still looks way off. Client contacted me last night, clips are way off on her monitor as well.

I opened up another client project that I'd rendered several months ago. I had no issue w/ the render after rerendering it today.