What steps will reproduce the problem? 1. set position: null or omit 2. open a modal box

What is the expected output? What do you see instead? box should be centered, box will have top/left set to 50% of window but since this.dialog.container does not yet have dimensions, hCenter and vCenter will have incorrect offsets

What version of the product are you using? On what operating system? xp - firefox 3

Please provide any additional information below. line 338: the modal contents im using have width and height css properties set so i changed 338 & 339 to hCenter = (w[0]/2) - (this.dialog.data.height()/2), vCenter = (w[1]/2) - (this.dialog.data.width()/2);

but this is not a general solution

I added a "fix" that uses data height/width if the container height/width does not exist. There will still be an issue if neither has a value - I probably should add a default.

hCenter = (w[0]/2) - ((this.dialog.container.height() || this.dialog.data.height())/2), vCenter = (w[1]/2) - ((this.dialog.container.width() || this.dialog.data.width())/2);

Try out 1.2.1 and see if that works for you.