I have a Salesforce app and the developers are struggling to get it to work with IE8/9.
It works fine on chrome, firefox and safari but there appears to be an issue related to the APEX communication between ie8/9 and Visualforce.
The 'fixes' in the following blog post have been tried and they dont seem to fix the issue. http://blogs.developerforce.com/developer-relations/2011/03/visualforce-rerender-and-internet-explorer-9.html
The problem appears to be with the AJAX communication between Visualforce and Apex code, in that communication information/signals from the presentation layer (Visualforce), is not reaching the business layer (Apex code) in IE8/9.
Does anyone know if there is a viable fix or workaround for the the problems associated with AJAX communication between Visualforce and Ajax layers on Internet Explorer 8 and 9?