If you are using SharePoint Designer (SPD) to create a master page file that will then be placed on the web server for use, such as with a custom site definition or custom Feature, you may run into the following error when viewing or creating a new site: Cannot convert type 'Microsoft.SharePoint.WebControls.ScriptLink' to 'System.Web.UI.IAttributeAccessor' This may be caused by the method you used to get your custom master page file out of the content database. If you used the Export...(read more)