I've installed the latest version and still have no luck with the new joint push pull in Windows 8.1. The old joint push pull still functions. I have a similar problem with AMD 7700 video card with latest updated driver and the following installed
extensions:SketchUcation
3DxSketchUp
BezierSpline
Dialog
Bulge
Push
Smooth
Smudge
Grab
Planar Lock
Arcs Circles
Fredo6 LibFredo6
Fredo6 Curviloft
Fredo6 Curvizard
Fredo6 FredoScale
Fredo6 Fredo Tools
Fredo6 JointPushPull
Fredo6 Round Corner
Fredo6 Tools on Surface
JointPushPull
quarr_jsalign
s4u-AlignTool
STL Import & Export
CleanUp³
TT_Lib²
Edge Tools²
Solid Inspector

Any suggestions?

Doesn't seem to work in my Windows 8.1 machine. Previous push/pull still works fine. It will highlight sections but not select more than one or if one is selected it will not extrude. Anyone else with this problem?