geometry - TriangleMeasurement causing problem when used in Manipulate

On my Windows 10 machine, Manipulate with TriangleMeasurement locks up once I start changing the sliders. Even with SynchronousUpdating -> False and ContinuousAction -> False it still locks up. Code below draws a triangle and then uses TriangleMeasurement to compute the area. It locks up after several movements of sliders. I wonder if someone could confirm this is reproducible or perhaps I'm not setting up Manipulate correctly.

Manipulate[
  a = {1, 4};
  b = {1, s2};
  c = {u2, v2};
  o = {0, 0};
  myTriangle = {EdgeForm[Black], FaceForm[], Triangle@{a, b, c}};
  cobArea = TriangleMeasurement[{a, o, c}, "Area"];
  Show[

    Graphics @ 
      {myTriangle, Line @ {o, c}, Line @ {o, b}, Line @ {o, a}}, 
      Axes -> True, PlotRange -> 5], 
  {{v2, -1}, -0.1, -5}, 
  {{s2, -1}, -0.1, -5}, 
  {{u2, -1}, -0.3, -5}, 
  TrackedSymbols :> True, 
  SynchronousUpdating -> False, 
  ContinuousAction -> False]