Calibration routine from ar2.py non-responsive

I have finally finished my AR2 build. I loaded the arduino sketch 2.0 and confirmed all limit switches operatonal. I could not run the exe to calibrate successfully on windows, I got a serial error for permissions on the com port that I could not resolve. I then tried to run the ar2.py on linux and got it to run. It takes my updated com port in the code (/dev/ttyUSB0) and then when I click the calibration button nothing happens.

Is there a linux-approved fork of ar2.py that someone has worked out the kinks? I can't get any feedback from the ar2.py program; I assume it's trying to move the motors but isn't moving because something is wrong but I'm not sure what. Any ideas? Anyone run into this before? thanks!