I've been trying to load mutliple Linux OS's off of USB thumbdrives using UNetbootin both 494 and UNetbootin 568 - I've tried Debian netinst and Live iso for i386 - Ive also tried loading up SLitas as well - and I keep getting the similar message when trying to load to Live mode - something about
Kernel Panic VFS unable to mount fs
or something along the lines of that

is this a common bug with Unetbootin that is causing this.

Btw - I've used FAT formatted usb drives. Nothing else.