First, do Help > System Info -- what's the exact version listed on the first line?
Lightroom version: 6.1.1 [ 1032027 ]
That's good. (The Adobe upgrade process is confusing, and people often end up running an old version even though they think they upgraded.)
What exactly happens when you try to import a G3 X raw? What's the exact wording of any messages?
Please check that you not transferring your raw image from your camera using any 3rd Party or Canon software.
Simply copy the images from the SD card and paste it on your computer anywhere and then import the images from there in Lightroom.
My normal procedure is to drag the files onto the Lr icon in the Dock. When I do that, no photos show up in the Import window.
When I used the Import Files menu choice, the CR2 files appear in the Import window!
Thanks for the suggestion.