Hello,
i have same problem. CSMIO IP-M Controller and Mach4. The Firmware v2.910 works only with Mach4 4.2.0.2803. With newer Mach4 versions, i get no connection to the controller. Then i tried the CSMIO v3.01 beta with Mach4 v4.2.0.3390 or v4.2.0.3418 but there is a other problem: when jogging in mm, the distance in mach4 does not coincide with the real. Changes of the steps per unit at Motor settings has no effect. The controller always outputs 1000 steps per mm.
The CSLAB support means it is a bug of Mach4.