Dragging tabs from tab bar issue in Safari 4.0.3

Whenever I drag a tab out of the tab bar to make it open in a new window, it shows the window thumbnail and will not open in a new window (hangs up). Yes, I am letting go of the trackpad and it still does not work. I have tried removing the Safari plist and still no work. Any ideas?

I figured it out after a couple of hours. It turned out to be RightZoom causing the issue. I excluded Safari from the list of applications for it to work in, and all is well again with Safari.