GP 2010 Management Reporter 2012 RU5 -- getting bad or missing data was encountered when generating new report or migrated report

Have installed MR 2012 RU5 with Data Mart. Migrated FRx specs. Corrected some minor issues in row formats. Now trying to generate a report and getting error -- 'Bad or missing data was encountered while loading the report and its building blocks. Report generation has been cancelled.'

I get the some error message whether I try to generate a new report that I created in MR or try to generate a report that was migrated from FRx.  Have tried using multiply MR admin user accounts.

Below is the error message that appears in the event log:

System.InvalidOperationException: Sequence contains no elements at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source) at Microsoft.Dynamics.Performance.Reporting.Engine.Common.ReportDefinitionAdapter.CreateFontStyle(Guid id, FontStyleDataSet fontDataset) at Microsoft.Dynamics.Performance.Reporting.Engine.Common.ReportDefinitionAdapter.LoadFontStyles(ReportDefinitionDataProvider dataProvider, Definition definition) at Microsoft.Dynamics.Performance.Reporting.Engine.Common.ReportDefinitionAdapter.CreateDefinition(ReportDefinitionDataProvider dataProvider, Guid masterCompanyId) at Microsoft.Dynamics.Performance.Reporting.ReportDesigner.ReportControl.GetReportDefinition(ReportDataSet reportDataSet, ReportingTreeDataSet treeData, List`1 selectedUnits, Boolean rollupUnits, FiscalPeriod basePeriodOverride) at Microsoft.Dynamics.Performance.Reporting.ReportDesigner.ReportControl.GenerateReportLocally()

Any ideas/suggestions would be appreciated.

Thanks,

John