Are you using the Pro Channel EQ or a 3rd party VST?
At the risk of getting flamed - if you are on the Pro Channel, that was my experience with X1. I'm sorry to say but that unpredictability led me toward a new DAW. I still use Sonar for many projects, but I don't use Pro Channel because it scares the hell out of me for that very reason.
EDIT TO ADD: I appreciate that you marked my post as helpful, but in fairness everyone else is doing a much better job of helping

As this thread continues to grow I realize that I was encountering a different problem than you were... I am leaving my post in tact (for reference/honesty) but it's not very relevant at this time...