I've got an ajax query that gets run when a certain button is clicked. While it's running, there's a modal dialog that has a 'Please wait' dialog that pops up, with the background darkened.

 

So far so good.

However, let's say I change the criteria for the query, and click the button again, the dialog comes up and the animated gif shows just fine, but the title does not show in the dialog. Everything else works great. here's my code for the dialog itself:
$("#ProgressDialog").dialog({
autoOpen: false,
modal: true,
 resizable: false,

 title: "Loading Data...",

 closeOnEscape: true

});