Hi, I have upgraded a test farm with 3 servers: Web front-end SharePoint 2010 SP1 EnterpriseWeb back-end SharePoint 2010 SP1 EnterpriseSQL Server 2008 R2 SP1 Enterprise I upgraded SQL Server 2008 R2 SP1 into SQL Server 2012. Everything works fine, except SSRS. When I try to open SSRS reports in my SharePoint libraries, they stuck at loading. Is anyone experienced (or has in idea) about migrating SSRS 2008 R2 to SSRS 2012 in SharePoint integrated mode? Thank you.

The issue occurring because it was necessary to install Microsoft SQL Server 2012 Reporting Services Add-in for Microsoft SharePoint Technologies 2010 at each SharePoint server in the farm.