I'm one of those rare birds that uses Turn most of the time & am comfortable with it. (XP w/parallel port.)
The few times I use Mill (standard screenset) something almost always goes wrong; usually self-inflicted. This time it's the MDI line. I press alt+2 & the line pops up as normal but when I type in a command, I get a beep as soon as I press enter & no movement from the motor. Even something simple like "G00 Y2." Jog works OK; just no MDI.
This is a new build & I only have the Y-axis hooked up & enabled for testing/alignment. Any guesses to what I'm forgetting?