It pins correctly on my PC.Anyway, here's a set of icons. Right-click StencylWorks' icon, in the taskbar, right-click again on StencylWorks and select Properties. From there, click on Change Icon and select the attached icon set.
It pins correctly on my computer... I pinned mine by opening it then right clicking on the icon then selecting pin. (I'm not sure if there is more than one way or not that's just the way i did it) Hope that helps.