OK. I started again from scratch.

* Uninstalled GarnetVM
* apt-get autoclean (don't know if that helped clean it up a bit)
* Reboot
* Reinstalled GarnetVM
* Mounted SD card using the code by gowen
* Installed AudibleAir
* Tried to download... crash!

Any ideas anyone?? Before I knew how to mount the SD as Slot1 it wouldnt crash when trying to download, rather just say there was no space.

Is it something to do with the card and how its mounted?