If your cards aren't recognized by the Eye-Fi software under Mountain Lion, please click the Eye-Fi Helper icon, choose About and make sure you are running 3.4.29 or above. If not, please quit Helper, delete the /Applications/Eye-Fi folder, empty your Trash, and install the latest update from our site.http://support.eye.fi/software/start/ey ... -download/
To launch the Eye-Fi.mpkg installer, right-click/Control-click and choose Open. For more info: http://support.eye.fi/software/start/in ... os-x-10-8/
I hope this helps! Our cards should always be recognized by Eye-Fi Helper no matter what firmware they are running.