Same problem, when I try to send a course to my device I get a blank dialog. Yesterday I was not able to send anything to my device ... now I am able to send an activity as track but not a course.
when i try send a workout to my 220 the send to device box just remains blank ..this has only happened in last few days ..im using a mac and have checked that my mac allows have script
same issue as well. I am running MAC OS Mavericks. I use Chrome, but the same issues comes up when using Safari even on a Windows Vista PC. I've tried reinstallind GArmin Express and I've just updated Java. This has started happening since a few days ago.
I tought it was the Modern Garmin Connect (which lags a lot by the way), but even the Classic doesn't work and since I've tried almost everything I think it's a bug.