Looks like if you have more than one Twitter account in your iPhone the latest Garmin Connect app version hangs when you turn Twitter on in LiveTrack. The account selector box comes up but stays blank and the app freezes.
Yeah I hit this yesterday while working on an article for live tracking software while cycling. I stopped using the Garmin app a long time ago because of bugs but I wanted to give it another shot for this article.
I had to delete all but one of my twitter accounts just to get a screenshot of the interface.
Sad to see that the quality level of the app hasn't improved since I ditched the live tracking over a year ago. :(