Thomas, you say it will have been fixed, but I am now running 1.0.4 and I can assure you it has not been fixed !
I am using Snow Leopard.
The issue is the same, plugin edit window will move down by as many pixels as the preset you selected was positioned in the menu - very annoying - if you pick a preset from the bottom of a long list, then the UI jumps down to the bottom of the screen !
Still a bug !