I have experienced the same behavior as pops. Any time the "Set start at line" doesn't work correctly it has been due to my failure to left click on the line before right clicking. That said, I find it very interesting that no matter which option you select, if you single step through a program after selecting a new start line, the program will cycle through the header lines (no big deal, probably a safety thing to make sure units and such are all correct) but for some reason it will then turn coolant on, then in the next step turn it off, THEN get to the selected start line. Without single stepping, all that happens too fast for the pump to actually turn on.