I don't have my controller with me right now, so I can't remember exactly, but it definitely sounds like like you switched the swashplate type on the controller.  I don't remember if there are one or two settings for the swash (I wanna say two), but one of them determines how the servos are mixed according to the swash type (can't remember what the other one does...if there's another one).  Anyway, you can start looking there.  I wish I had my controller and manual handy, so I could have been more help.