CX-20 (open source) APM, cannot download logs via mavlink

Im having a problem with loiter mode not working correctly (quad just starts flying away) while stabilize and Alt-hold are rock solid.

I’ve checked and rechecked everything relating to compass and GPS settings but what is really screwing me is the inability to download logs to see whats actually happening.

I -AM- doing it the right way, via USB and from the flight data screen selecting download logs via Mavlink.

I’ve tried searching here and google but all I can find is other people with the same problem but no real answers.

Here is a link to the problem im having BTW: