Did you follow the steps in this video.
communities.bentley.com/.../4729
You select the surfaces first, add them to the dialog list, then click on the create profile icon to switch to that part of the dialog, then click the place profile element and data point in the file where you want to start and where you want to stop the profile. Then you go to the preferences and adjust the scale and such.
Try to watch the video and follow along to see if that helps.
communities.bentley.com/.../4729
You select the surfaces first, add them to the dialog list, then click on the create profile icon to switch to that part of the dialog, then click the place profile element and data point in the file where you want to start and where you want to stop the profile. Then you go to the preferences and adjust the scale and such.
Try to watch the video and follow along to see if that helps.