I am having the same problem. The led's light up in the diagnostic page when I press any 1 of the 3 home switches, but when I ref all, the axis motor does not stop. I crossed checked the port and pin configuration between the c25 bob and the home settings and they are match. I am using an ESS board between the machine and computer. Everything else works fine including all axis movements. I have also tried my laptop, but the results are the same. There must be a parameter setting that I am missing? Stumped on this one!