Crystal Reports 2008 - with PeopleSoft v9.2 & PeopleTools v8.55.xx - Error messages "Failed to retrieve data from database" & "Database Connector Error: Cannot obtain error message from server."

We're going through the steps of converting to BI-Pub and have made a lot of progress, but would like to have our old Crystal Reports 2008 client set up functional as back up for some reports.  We've heard that some folks have it working in combination with PeopleSoft v9.2 and PeopleTools v8.55.xx.  Was curious if any readers here have been successful in doing so?  Our test VMs are Win7 64bit.  Oracle v12.1.0 client installed.  I've successfully installed Crystal Reports 2008 and we can get as far as opening the report and creating a new connection to log on to the server, but when we try to run reports we get a "Failed to retrieve data from database" message followed by a "Database Connector Error: 'Cannot obtain error message from server.' "

No error message number makes it hard to troubleshoot.  Any thoughts would be appreciated.