IE yielding different dialog heights than other browsers

In my project, I am loading content from a server via AJAX into a dialog. Typically, the height of the resulting dialog is known, so we show the dialog with a loading message to tell the user what's happening, and to prevent them from clicking the launch point multiple times. The problem is that sometimes (specifically, the first time that the dialog is loaded) in IE the height of the inner part of the dialog (being the element that you call .dialog() on to begin with) is calculated to be ''smaller'' than expected, resulting in scroll bars being placed in the dialog when the AJAX content is loaded.

I stepped through the jquery ui code in a debug tool, and it seems as if IE is overestimating the height of the other components in the dialog (such as the title bar, button pane, etc.).