Hi Nick,
I just did a search and found this thread after getting the same error message in XDCam transfer. I figured out the issue was that I had used non-standard characters (e.g. * /) when renaming the problem subclips. After deleting those characters, they imported fine. Hope this helps if the problem comes up again.
Lars Kongshaug
Vid-smith digital video production
http://www.vidsmithvideo.com