Can't View Photo in LRC

I was working on a RAW file in LRC and it just disapeared from view. The file is still in its folder and I can see it when I use import file, but it shows as an image that is already in Lightroom. It dispeared immediately after I created a virtual copy and converted to black and white. The image count in the Library shows 21 images in the folder but only 19 images appear as thumbnails. I just updated to the current version of LRC and can't recall ever seeing this behavior before.