Question for all you mutt users

Okay i switched from sylpheed to mutt because text looks pretty :) I am
having some problems though, Its not marking new emails as new, making
it really hard to tell when i have new mail :) If anyone knows what
setting i need to change to fix this i would appreciate it :) I read
through the mutt manual and found the mark_old setting but i set it and
its still not working. Even though its supossed to be set by default.

--
BoBB