Pete,
I don't know as I was just responding to the OP's question with my past experience in other versions with this. I don't know if it changed from 4.3 to 4.4 as I have not tried to use a "Lightroom-camera connected" transfer for awhile now. Now I use a card reader or if transfering directly from the camera I use Image Capture. This seems to be a LONG term problem with it working in one release and then not working in the next since apparently version 2. I have seen this question asked a lot on the forum and the senario is always that it worked in the previous release but not the new one. Lee Jay was correct in saying use a card reader and it will work!! It seems like if the OS (both Windows and Mac) can consistiently copy the files off the camera that Lightroom should be able too also and that it is NOT a hardware problem. BTW, I must compliment Adobe on PV2012 and how well it works. Great job.
Bob