Hi Jason,
Based on my understanding, after you move the report from Reporting Services 2005 to Reporting Services 2012, the report can’t display well.
In Reporting Services, upgrading a report definition in SQL Server Data Tools is the only way to upgrade the .rdl file. In your scenario, if the .rdl file isn’t upgraded in the new environment, it’s expected that the report won’t display well. So please open an .rdl file in Report Designer in SQL Server Data Tools (SSDT) within the new environment, then the Report Designer will automatically create a backup file and upgrades the report to the current namespace. After a report is upgraded, you might notice additional errors, warnings, and messages. This is the result of changes to the internal report object model and processing components, which cause messages to appear when underlying problems in the report are detected.
Reference:
Upgrade Reports
If you have any question, please feel free to ask.
Best regards,
Qiuyun Yu
Qiuyun Yu
TechNet Community Support
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