Took some pictures off of my cards this weekend and I can not see any pictures in the library module. They are there in the develop module but they don't show up in the library module. I tried transfering the photos from another spot on my hard drive, tried another camera, multiple cards and it still doesn't work. Uninstalled program and reinstalled and updated. I'm using the stand alone version of Lightroom 6 not the CC version.
If you see those pictures in the develop module in Lightroom then, that means those pictures are present in Lightroom Catalog.
In the develop module, right click/ command click on of those images and choose "go to folder in Library" and that should take you to the specific folder in Library module where those images are present.
If you see them one at a time in Library module (in loupe view), press "g" letter on your keyboard to see them in grid view.
Let us know if you need any further assistance.