Course's will only give turn warnings if you place them in the file. It will only calculate when you initially start the course, it will not calculate or recalculate again. If you have left the course and find your way back to it you will get a notice that says course found, updating virtual partner.
When menu path are you following when you launch the course on your Edge?
What is the file extension on it? TCX is a course, GPX is a route.