Try this: set the display to factory default settings. Then calibrate again. And remember to shut all ambient lighting off during calibrating. It worked on my 2209WA. I use Spyder3Pro.
EOS 40D+BG-EN3/350D/17-40 f4L/70-200 f4L IS/50 f1.8/18-55 f5.6/MacBook&ThinkPad