If you’re developing an ASP.NET application that utilizes Microsoft’s SSRS ReportViewer control, you may experience a weird behavior while trying to use it on 64 bit version of IIS7 (Windows Server 2008 or Windows 7) – nothing is displayed in the main report area and even icons, such as Print, Export aren’t rendering.

One possible cause for this – your application is using Application Pool with 32bit mode enabled. If so – disable it or switch to a different application pool. Chances are this will fix the above issue.