Jungledisk blocked?

Does anyone use Jungledisk? It's a online backup service that's supposed to show up as a Network drive in Windows. It has been working for the past year, but recently stopped working.  Now the network drive doesn't show up at all. I haven't made any changes to the PC except updates. Jungledisk support says it must be being blocked by Norton Internet Security. I've allowed Jungledisk in the Norton Firewall settings but that didn't help. (I have Windows 7 and the latest version of Norton Internet Security)

 

Does anyone have any advice?