I changed my order so it should not change if Yahoo changed the ranking. I would have to assume if you don't change your order, the order will change as yahoo changes theirs. As I said before the only ranking I changed was moving Manning to the top. Here is my order I'm currently showing:

Your Rankings
1. Peyton Manning

Default Rankings
2. LaDainian Tomlinson
3. Joseph Addai
4. Larry Johnson
5. Shaun Alexander
6. Brian Westbrook
7. Randy Moss
8. Frank Gore
9. Willie Parker
10. Terrell Owens
11. Tom Brady
12. Rudi Johnson
13. Chad Johnson
14. Edgerrin James
15. Carson Palmer
16. Steve Smith
17. T.J. Houshmandzadeh
18. Clinton Portis
19. Reggie Bush
20. Antonio Gates
21. Ronnie Brown
22. Adrian Peterson
23. Tony Romo
24. Marshawn Lynch
25. Plaxico Burress

I don't remember what it was right before the draft, but I would bet any players that you do not change their ranking will get adjusted as yahoo changes them. Any player that you changed their ranking will stay as you changed them. If I get time I will read the FAQ and see if that is right.