When we are working with a large assembly certain parts will not show their tangent lines. The majority of parts in the assembly show their tangent lines but a few will not. You have to open the part, open and close the sketch that is related to the feature that isn't showing tangent lines, and then go back to the main assembly to see the tangent lines. We use the tangent lines quite frequently and it can be a real pain to have to open particular parts and go through this process just to see them. Any one else have this problem or know the solution?