I just completed a new Makerbot thingomatic build and am trying to test everything out. I noticed that the ABP motor will not turn. When I select the ABP belt in the control panel the extruder fan comes on (oddly), the belt won't move. The fan button also turns on the fan (as would be expected). I have double checked the wiring and am quite confident it is correct. Anyway, I searched the troubleshooting area and see that someone said I need to update my system to v3.1 to resolve this problem.

So...I am trying to upgrade the firmware and cannot get it to work. I am doing this from a Macbook Pro running 10.7.2 and I installed the ftdi driver included in the replicatorG distribution. When I start replicatorG it connects fine and tells me I have Motherboard firmware v3.0, etc. I select firmware upgrade for a v2.x(Gen4) with Mega2560 and click next. I select 3.1, click next (it tells me I need to update Motherboard, Extruders, ReplicatorG). I select my serial port (same as set up for connection), click next. Then I get the dialog to click upload just after clicking reset button on motherboard. I have done this dozens of times. Every time nothing at all happens. I let it sit for 10-15minutes even though there is no indication that anything is happening. Eventually I force-quit replicatorG and try again. As I say, I have tried many many times trying to press the reset and upload buttons at the same time, just after each other, etc etc. What could be wrong?