I'm seeing the same behavior here. Fresh 1.4.5 install w/MH, only mods installed are Konstruction, AGM Cont'd, Alcubierrie Standalone, kOS, Editor Ex Redux (linuxgurugamer), Janitor's Closet, UbioZur Welding, all via CKAN and current.
When I stick a magno-pad on an object and put out a crane or arm with a magnet, and set magnet ON w/force up to max and targeting ON, I get nothing. As soon as I shut off targeting it usually catapults the object, and often destroys the crane... Fun, :-) so the magnetism is working, but seems like targeting/pads aren't working.
Do I need to do/install something else for the pads to work? Bug?