Mbox pro 3 feedback loop reamping

[Sidecut]

Pro Tools 10
MBox 3 Pro
Fractal AxeFX II (GTR FX amp sim)

This should be easy not sure where I am going wrong. I am trying to reamp using an AXeFX. Here is my signal path:

Hardware Output 3 from the MBox into the Line input on the AxeFX. As soon as I enable the input for the AXEFX I get a feedback loop without even assigning an output in Pro Tools.The outputs from the AXEFX are returning to M Box inputs 3 and 4.

I'm assuming this is something to do with the Mbox routing software. Any help would be appreciated.

[mesaone]

Go into the control panel for your MBOX, and mute hardware input channels 3 and 4.

This will not prevent you from passing audio to/from Pro Tools, but it will disable the MBOX's direct monitoring, so you won't get a feedback loop.