Hi,
I just acquired 920XT. I installed 920XT Garmin Connect and synchronized smoothly, the first time (with MacBookPro OSX 10.10.2).
Now I can not open the application, even without connecting the 920XT. When I click the incone, the application wants to re-install. If I accept, application bug systematically. I have to completely uninstall Garmin Connect (with preference files, caches, etc ...), re-install the whole thing can I connect the first time, then again BUG.
I tried another MacBookPro with OSX10.10.1, same problem.
I contacted Garmin French support, who was surprised at my failure ... Have you ever encountered this problem with OSX 10.10?
NB: Sorry for my English