We use ECI M1 ERP. It has a multitude of premade crystal reports. It uses I think CR2011, not totally sure. When I installed CR2016 DEVELOPER, I started getting "unable to cast COM object of type 'CrystalDecisions.ReportAppServer.Controllers.ReportSourceClass' to interface type. This issue did not exist until we installed CR2016 Developer to the 3 machines, all of which show this error when ECI M1 reports are displayed.
ECI is adamant it is not their fault and they will not assist to fix this. I've submitted this several times and each time it is escalated to tier 2 and they stand on SAP must fix this since they broke a working program. At present time, I must RDP to a desktop to view a report after deploying. All other desktops are unaffected, only the three which installed CR2016. Please help, I am at my wits end.