I have similar problems but I do not have any video files to import, just stills. The files import via usb but many files read "error" unable to work on this file. Some photos I can export to Nik Color Efex4, save as tiff, then LR4.4 shows it as an error "unable...". If I close LR4.4 some of the problem files are okay, and different ones are not okay, the tiff's that were not okay, now they work fine. Puzzling.
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