When using the AutoCompleteExtender with version 15.1 (this existed in previous versions as well) in Google Chrome, if the browser is not at the top of the page and you click on the scrollbar (see the sample site for an example with a scrollbar) then the autocomplete list loses focus and hides the list.
This only seems to occur in Chrome, and only when the page is not scrolled to the top.
This only seems to occur in Chrome, and only when the page is not scrolled to the top.