The work zero should be remembered, even after shutting everything down and re-homing the next day when you start up. I had this same case this morning. Cut a bunch of 18" circles last night, shut everything down and closed out OB Control. Came down today and fired everything up. When I start OB Control it shows me some random (?) numbers like 629 and 744 for the X,Y coords. After unlocking and re-homing it shows the actual values of the last set work zero as it relates to home. In my case it was -1.xx, 0, and 1.xx for the X,Y,Z. As long as I get my square blanks back into the same spot, I can load the gcode, run job and that's that.