Mike,
The problem is that the Jungo drivers and real AVRISP-MKII use
endpoint addresses that aren't possible with the AVR8 devices, so I
have to do some tricks to work around that (this is what building
without the compat switch does). That works enough to fool AVRStudio/
AtmelStudio, but breaks under AVRDude as it uses a different
interaction sequence to the programmer. There's actually an AVRDude
patch floating around on AVRFreaks to fix AVRDude so that it can work
with my clone programmer in non-conpat mode, but that would require
you to rebuild the AVRDude binaries.
Cheers!
- Dean