I'm trying to run IGV (IGV_2.4.2, starting it as an app, not webstart) on a Mac running OSX 10.11.16 with Java 8 update 44.
It can't download the genome list (let alone the genome), see attached log file and popup.
In the end I managed to download things and it worked after a few restarts, but it doesn't work out of the box, so you you prolly want to look in to that. Regards,
Philip