While playing around with WSMLink, I've encountered an issue where WSMPlot returns and empty plot when plotting sensitivities. Plotting other simulation variables works fine. Here's an example right out of the WSMLink documentation for WSMSimulateSensitivity:

mmodel = "MathematicaExamples.Basic.DiffEq";

\[ScriptCapitalM] = WSMSimulateSensitivity[mmodel, {0, 5}, {"a"}]

WSMPlot[\[ScriptCapitalM], {{"y", "a", 0.1}, {"z", "a", 0.1}}]

However, this works fine:

Any ideas about what is going on? I'm running Mathematica 10.4.1 and SystemModeler 4.0.1 on Windows 10.