I'm exporting the character from MakeHuman with the MHX format with a rig "CMU mb" or the "Game Engine". Then I imported the file to blender overriding the exported data and selecting the MHX as the Rig Type

After that I go to the MHX2 Runtime panel and switch all the FK to IK.

My problem: it doesn't work, if I grab the hand (or any part) it doesn't work as expected.

My blender version is 2.78. Any ideas? Thanks.