AJAX ProgressUpdate issue

I had an issue with the UpdatePanel and ProgressUpdate AJAX extensions controls in ASP.NET.

The following error occurred in the Javascript:

if (this._dynamicLayout) this.get_element().style.display = 'block';

I solved the problem by moving my ProgressUpdate control out of the UpdatePanel's tags. I guess I was looking for trouble when I did that.

Having the ProgressUpdate within the UpdatePanel work in certain instances, but I also had another UpdatePanel in the same UserControl, so it got a bit hairy.

I'd like to verify this, but as always, the deadline looms.