Howdy. So we were having issues with M4 freezing. We uninstalled and re-installed the latest. As it happens, our PMDX Smart Bob 411gave up the ghost about the same time (PMDX is graciously repairing it). But, we bought an ethernet Smoothstepper to avoid USB connections. Anyway, after a lot of struggle and paying a company to set up the ESS with M4, our Y axis runs backwards when we try to run a file. New files or files made before the switch. When we hit execute G code, Y crashes into the home switch. I tried a bunch of things that I thought would reverse the issue but so far to no avail. If anyone has any ideas, we really need to hear them. Thank you.