Is your chamfer angle 45°?
I believe NX will only apply chamfer dimensions to symmetrical chamfers (those that are 45°). All others need to have standard dimensions applied to define the chamfer (2 offsets; 1 offset and 1 angle).
Tim Flater
NX Designer
NX 11.0.1.11 MP4
Win7 Enterprise x64 SP1
Intel Core i7 2.5GHz 16GB RAM
4GB NVIDIA Quadro K3100M