I am testing PhotoMechanic as well and am also having difficulty tagging. I have a GPX file which I imported and the track looked fine; I did have to do an offset (not sure why - the times display properly on my GPS and on my map software, but that's OK). I set them to a -5 hr offset, and they displayed properly and found the correct batch of photos during that time frame, and displayed them in the correct location. I hit "Import GPS Coordinates" on the lower right, and it said it was applying it to all the photos in the batch, but it didn't. When I went to view the files (right click > Show Map), it does not indicate any GPS data.
I don't remember, when I was testing PM last month, if I geotagged from PM. I think I only got to the point of viewing previously geotagged photos. I might have tried tagging photos individually, but not by importing a GPX file. Any assistance would be appreciated, because the majority of my geotagging will be by using a GPX file from my GPS.
I am testing PM 4.6.1 (the most current beta, from a couple of days ago)...I use Windows Vista. My photos are also Nikon .NEF format (taken with a Nikon D50).
However, the function works perfectly with JPG files I extracted from RAW. So, it only does not work with the .NEF files.
Thanks,
Jennifer