The contour flange command requires tangential connections when transitioning from a line to arc and vise-versa. For line to line, or arc to arc, this is not required. All you need to do is add two very small tangent arcs to connect the line to the arc and back to the line.
HTH,
Ryan
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Ryan Gudorf
CAD/CAM Supervisor
Budde Sheet Metal Works, Inc.
Windows 7 Professional x64 SP1
Solid Edge V20
NX8.0.0.25
TC8 in Testing
6 GB RAM, nVIDIA Quadro FX4800