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Ajax config feature - Failed to apply a web.config modification to file 'configuration/system.web/pages


The ajax config feature sometimes throws up exception "Failed to apply a web.config modification to file 'configuration/system.web/pages". Though the feature fails to activate, it still creates all the config entries. Any idea why this exception occurs?
By default when a new webapp is created, it already has the node <pages enableSessionState="false" enableViewState="true" enableViewStateMac="true" validateRequest="false" pageParserFilterType="Microsoft.SharePoint.ApplicationRuntime.SPPageParserFilter, Microsoft.SharePoint, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c" asyncTimeout="7"/>. Is there a need to add this node again through the feature?
The fix didn't work for me. Is there a new version with the fix?