Prior to that, the linetype as seen in the attached screen short displayed the same for both the alignment style (green) and the polyline (white). After 2.1, they display at different scales. Why? There now seems to be a problem with linetype scaling in the style definitions.
The same linetype is used in the alignment style as is assigned to the polyline. The scale is the same for both (in the alignment style definition and as assigned to the polyline).
The only thing that changed is that on Friday morning, I installed the update 2.1 and this is what things looked like in existing model files when I opened them that displayed correctly when I went home on Thursday. Open this file on my computer and it displays according to the attached screen shot. Open the exact same file on another team member's computer and they display at the same scale. How is that possible?