No, I didn't specifically, but think I figured out the issue anyway. I actually tried hitting Run to preview the report, based on a forum reply elsewhere on another similar issue and was at least able to see more information about the error. It pointed to an issue with the security; apparently when converting over the project it dropped the usernames on all of the saved datasource credentials so I needed to re-add all of them.

Not sure why the full error message info wasn't showing up when previewing normally, but this issue appears to be solved.

Thank you for taking the time to review!

🙂