I have a report that was developed by one of our developers and when moved to PROD it works fine in SSRS but it's being called by an app and being rendered by ReportViewer 10 and not working. There's no error, it just seems to time out and does nothing. It works find through the app in DEV though. I recently upgraded the DEV SQL Server with SSRS from SQL 2014 SP1 to SQL 2014 SP2. PROD is still SQL 2014 SP1. Would downloading the report from DEV (SQL 2014 SP2) and uploading it to PROD (SQL 2014 SP1) have any issues? It works fine in PROD in SSRS just not in the app that was developed and using ReportViewer 10.