Any progress, Geno?
Your problem sounds familiar, in that I believe I have seen something like that happen on occasion, but I don't remember it being repetitive in a way I could duplicate and that I could actually identify a cause. My default setting is to do it as a tiff @ 16 bits, so I haven't messed with psd.
Maybe the next time you see this, you might want to thoroughly check your settings. Also, make sure Photoshop isn't doing something "funny" with its view/Window settings and hiding your picture!
And, the next time this happens, check -- is a Ligthroom copy created (a tiff/psd) and appearing in your library? It should, although it may be "stacked" with the cr2.