OP updated with motochopper 1.2. It now includes an updated script for Mac/Linux (thanks tECHIDNA and LivingInKaos). It now has the ability to help those where the script fails due to old remnants of su kicking around on the system partition. Just drop the system.img.ext4 file from the FXZ in the system dir and it'll flash it for you as part of the process to give you a clean start on rooting.
I think old remnants of su is my problem, but I don't fully understand what you are saying to do. What system dir? I wouldn't say I'm a newbie, but as a windows dev, android is a little bit of a different environment than I am used to.
Here is what happens when I run the batch file. I have [re]downloaded the usb drivers, am using the stock cable, and the post is 2.0.
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(I can also get it to not fail on installing Superuser.apk by uninstalling SuperSU before running the batch file.) Once I've run the bat, I go to open SuperSU and receive a popup "The SU binary needs to be updated, continue?" When I hit ok, I get a second box asking for "normal" or "twrp/cwm," since I don't know what that is, I assume normal but that results in an "install failed" (and the other doesn't appear to do anything).
I believe my boot loader is unlocked (since it warns me on every boot).
All I want to do is let tasker turn my GPS on and off
Droid razr hd - 9.18.79.xt926.Verizon.en.US