If you have followed the migration path from the beta to RTM (not sure if we can call that a migration path… – ie manually change the version number in the SQL database … not supported !!) you may have seen an error for all you content query Web Part.

The error message is that the Web Part cannot be displayed :

image

Thanks to the correlation ID you can now dig into the SharePoint logs and and see that the error is due to the ItemStyle.xls file that has changed from the beta to the RTM.

Indeed, the ItemSytle.xls file for the beta has a reference to an attribute named ItemsHasStreams that does not exist anymore in the RTM. To fix it, just reuse the new ItemStyle.xls of the RTM and reapplied your change.

Everything should work perfectly after !