First thing to do, if you haven't already, is turn off the option to use the GPU on the Performance tab of the LR preferences.
If you can import, Edit and Export D7200 files then they MUST be showing up in the Library module. Otherwise how would you be able to actually select any of them to edit in the develop module.
Please explain exactly what you mean by Don't Show Up.
When I import them, the pics all show up in the thumbnail window, just as they normally do when you import. But there is no folder for them in the folder list to the left side. I've closed out, restarted, etc. I then took a sample pic with the D7000 and a new folder shows up in the folder list with today's date. Everything is as if they downloaded properly, but no new folder appears. I'm sure they downloaded properly but the folder doesn't show up there OR in my Pictures folder.
Check your import setting when importing images from that D7200 camera. Check the Destination location for the same. Check if any Preset is being applied.
To find what folder they are going into right click on any of the D7200 images and select Show in Finder/Explorer (whichever for your OS) and a file manager window will open to the folder it is located in. Check for that folder in the Folders list in the LR Library module (It has to be there).
OKAAY! Just slap me, lol. Finding the folder it was going to did it. This is a new camera and I apparently set the year to 2015 by accident. I never thought to look back at folders from a year ago to find them. Thank you SOO much for helping me out with this. Sometimes it's the simple things...