First off, not sure if there's a special place where 2010 bugs get herded now that the beta forums are closed? Just create an SPR?

Anyway, here's a file with a sketch of an involute of a circle. The size of the involute is (meant to be) driven by the radius of the circle. It draws fine the first time but doesn't update when the value of the circle is changed.

Secondly, SW crashes when you try and create another sketch on the Front plane, select the spline and Convert Entities.