Error in Navigation Center

I get the following error on version PV910 SV100 on a 9.2.0 install when running the Dashboard Maintenance Audit reports for Parameters, this one is for the Updated report.

There was an error processing report 'rpt_DashboardMaintenanceUpdated_ONC'.

Error processing DataSet ‘DashboardMaintenanceUpdated’. Error executing Workspace Assembly Service class ‘Workspace.ONC.Assembly_ONC.ServiceFactory.The conversion of a nvarchar data type to a datetime data type resulted in an out-of-range value.

And the Assembly is encrypted, so can't take a look under the bonnet.

Any ideas?