Hi,
I am using Malcolm 2.0 in Maya 2018. The FK controllers for the arms work, however the IK does not.
I referenced in the rig but i wouldn't see why that would make the rig not work completely.

Does anybody have any solves?

Maybe you didn't turn on the ik attribute? For example setAttr "malcolm_v200:ctlArmIkLf.Ik" 1;