We're using Reportviewer and rdlc files in our application. I had drillthroughs working fine and we put the app on the backburner to work on other projects. Now that the Users wanted a new build I revisited the app and tested with a new password in the connection string. To my surprise the Drillthroughs no longer work. To my further surprise I can't even click on the textbox that fires the drillthrough. I checked TFS and there have been no changes to the Report definition or the ViewModel that handles the Drillthrough. All I changed were the connection strings.

If anyone can point me in the right direction on how to figure this one out I'll be very happy.