In our client application making use of the .NET WebBrowser control, about 1% of our users are reporting no-action when clicking on an ImageButton, LinkButton, or any ASP.NET control that submits its request via DoPostBack().
When the same users access the page directly in IE, the controls behave normally.
What could be causing the discrepancy?
End-user versions: IE Version 7 - specifically 7.0.5730.13 Firefox (default browser) - version 3.0.6