Sporty, this behavior started of course when soft limits were turned on ! Look in the homing,limits setup page and you will see soft limits min and max ! If you set them all up the way they need to be for your machine they are a very good thing and will prevent overtravel and going through a limit. Just be sure to turn it off to re home machine, and turn it back on after you home and drive off of home enough to clear soft limits. Also, i found the best way to set the max limit is to run machine into the oposite limits, then write this value minus a safe value into the setup, also you can set home "z" value by by clearing z work piece offset and zeroing the face of the spindle to the table with feeler gauge and leave a few thou clearance, turn off auto zero, and re referance the z axis and write this value into setup and re turn on auto zero, so that when you home referance z this value is automatically put into the dro and the face of spindle (no tool or holder !) is now a known distance from table top. When it is all set up properly it is ever so nice to use, just measure tool, measure wpo, and you know your there ! Play with it till you know it well, and use the slow zone setting too so that when you drive to the limit it will slow down and creep up to the set stop point ! Keep in mind that the z setting at the table will be needing either setting for the job, each and every time you change or a value which will be ignored in the job. I set it to face of spindle to table value so it is ignore in job so it is still possible to drive a tool into table, but it won't fault you out in program and cutting part.