I'm a long term use of Jungle Disk work group and have just switched from Ubuntu 10.04 to Linux Mint 14.1 with Mate desktop, 32 bit version. Having similar problems. The Jungledisk driver seems to install properly, but when I try to run it the desktop jumps a bit vertically and nothing happens. I have two other computers, not yet migrated to Mint, one running Ubuntu 11.10 and another with Ubuntu 12.04, all Gnome desktop 32 bits, all working fine with Jungle Disk Workgroup. Hmmm . . . Hopefully this little bit of information may help someone nail down where the issue is coming from.
xian (short for Christian