Well i found the mhx2 runtime panel but not the ik/fk switch
could you maybe make a screenshot of it or explain it again?
what i did:
i selected the root bone (the bone on the Hip which moves all other bones)
i scanned through all options in the toolbar on the left
i also didnt find anything on the right bar
the only thing the mhx2 runtime showes for me in the shapekeys section is :
add faceshape drivers
add other shape drivers
both dont do anything
and the other options ar greyed out
there is an IK checkbox in the toolbox under poseoptions but this one doent work for me
btw i have v.2.77 of blender and the add ons tab tells me that mhx2 Runtime is v.0.27 im not exactly sure if both are the most recent versions but they cant be old ...