nope... never seen it before but...
The word clamp is not in the marlin firmware, anywhere but it is in the pronterface code.
Reading the code It happens when you try and move X,Y or Z outside of the defined area of the printer
Check your Width, Depth and Height dimensions in your pronterface settings match your printer
Also you need to home each axis at the start of print to reset the axis 0 positions to their correct place. If you don't do this the power on position is set to 0.