I did this a couple of years ago and now can't seem to get it to work.
I followed all of the instructions in the help section and the "saving" window pops up for about 2 seconds and goes away and of course does not save. I am using TW4 Pro. I tried selecting all the different formats but none work.
Nikon D300, D3s, Nikon 10.5 lens, RingT105N+Footplate+MrotatorTCPs, Giottos MT9261 Tripod, Manfrotto 410 Jr geared head.
If you know the "secret" then everyday is a good day!