Thanks for providing the screenshot. However, It is hard to tell from the screenshot if it is a legitimate error or not. The red area indicates an error.
Please confirm the following:
1. Did you install Esri Production Mapping 10 or ArcGIS Data Reviewer 10?
2. What is the build number for Esri Production Mapping 10 or ArcGIS Data Reviewer 10?
3. Can you send a screenshot of your Polygon Sliver Check Properties dialog?
4. Can you attach the data?