There is only one way this can happen.
The switches WERE MISWIRED when you got there...unless the switch is damaged..
look at this: http://www.lowes.com/lkn?action=howTo&p=...avHowTo#wiring1
Heres what you do..
find where the power comes in...AT THE SWITCH..SW 1..
find/identify the HOT/FEED conductor that goes to the light..this is the COMMON..
then identify two wires as travelers..make sure toi keep them on the same corresponding brass/white scres between the sw1 & sw2
the hot/feed (common)goes to the BLACK screw on one switch for the POWER IN.. SW 1
the supply (POWER OUT) to the LIGHT goes to the OTHER black screw (common) on the OTHER switch.. SW 2
connect the neutral at the light ONLY..and the feed from the sw 2 to the light..
do that and it has to work!
anything else and it wont work properly!
hope that helps..
[This message has been edited by mustangelectric (edited 03-17-2005).]