Okay, I have done as much to this as I can. I am not sure what is going on with this. Machine description: Using standard Open Builds parts, nothing custom made. 1000x1000 mm CBeam contruction. Lead screw with stepper motor and a XPro from Spark Concepts Software is combination of ESTLCam and UGS When initially built, everything was good, I could use UGS to control the machine with the arrow keys on my keyboard, and it would move correctly. I could hold down the arrow keys and it would move along the chosen axis just fine. Problem description: I had a problem with the ESTLCam software where I had incorrectly chosen standard instead of metric, so it sent the machine on a wild chase, and it hung on the stock for a bit before I could shut it down. Now when I hold down the arrow key for the X Axis, it will spin for a bit and then hang like it is binding. Y Axis works fine, and Z Axis does the same thing as X Axis. Video is attached to show X vs Y axis operation. Can someone please give some pointers as to what to check/adjust/replace? THANK YOU!