I am seeing the exact same behavior. This has also meant that I cannot import an aperture library for the same reason. I am switching over from Aperture to LR, however I am unable to import.
Did you find a solution?
Yes, I get the same problem. I did not have it with CC 2014 nor for the first few days of CC 2015.
But I am not sure if its the video files or anything else. Just wont import or add any folder. It just crashes most or says not found any photos or video.
I have also installed Lightroom 5, and since I had the problems with CC 15, it allowed me to import but not anymore.
Then I imported them via Bridge and change them from NEFF (Raw Nikon format) to DNG and had a success once, but now not even this its working.
This is not good!
I think it is indeed the video files causing the trouble.
I now import them through Bridge, put them in folder without any video on, and then import to Lightroom from those folders.
It works, though its adding about two or three more steps.