Hi Xavier,
SEM is a great program. Thank you for all your effort thus far!
We've had several issues with different Nikon cameras on my 2011 15" MacBook Pro (16GB RAM, 2.2 GHz processor, running OS X Yosemite 10.10.5). These include:
1. we could see two cameras connected (e.g., D800 and a D70), but could only fire one of them (i.e., D800),
2. SEM could not activate Live View in the D800,
3. the program crashed when we tried to Quit it, and
4. the program could see a D200 but could not FIRE the shutter (the camera's battery is at 44 %).
Finally, when asking SEM to LOAD a script, the screen shows a beach ball for ~ 5 seconds. Ditto when you ask it actually load the txt file (which it eventually did).
Clear Skies,
John
EDIT
I just tried SEM on a 2006 vintage MacBook Pro and it could see & FIRE the D70, but could not even see the D200. FWIW, the CF card in the D200 has a bunch of images on it (but it's a large capacity unit).