I'm also having a similar problem since upgrading to the latest version of Reports. Before the upgrade reports worked fine, after the upgrade reports with nested tables started throwing this exception.
I'm going to have to roll back to an older version for now unless anyone has an idea how to fix this issue
Stack Trace:
[IndexOutOfRangeException: Index was outside the bounds of the array.]
Telerik.Reporting.Paging.Table.CellAt(Int32 rowIndex, Int32 columnIndex) +108
Telerik.Reporting.Paging.Table.RenderCells(TableRegion region, RectangleRF clip, Double left, Double top, Double reservedLeft, Double reservedTop) +72
Telerik.Reporting.Paging.Table.AddChildrenToPage(RectangleRF clip) +595
Telerik.Reporting.Paging.PagingElementBase.AddToPageRecursive(RectangleRF parentClip, Double parentTop, Double parentLeft, Double parentReservedTop, Double parentReservedBottom, Double parentReservedLeft, Double parentReservedRight) +816
Telerik.Reporting.Paging.Table.RenderCells(TableRegion region, RectangleRF clip, Double left, Double top, Double reservedLeft, Double reservedTop) +261
Telerik.Reporting.Paging.Table.AddChildrenToPage(RectangleRF clip) +595
Telerik.Reporting.Paging.PagingElementBase.AddToPageRecursive(RectangleRF parentClip, Double parentTop, Double parentLeft, Double parentReservedTop, Double parentReservedBottom, Double parentReservedLeft, Double parentReservedRight) +816
Telerik.Reporting.Paging.PagingElementBase.AddChildrenToPage(RectangleRF clip) +193
Telerik.Reporting.Paging.PagingElementBase.AddToPageRecursive(RectangleRF parentClip, Double parentTop, Double parentLeft, Double parentReservedTop, Double parentReservedBottom, Double parentReservedLeft, Double parentReservedRight) +816
Telerik.Reporting.Paging.PagingElementBase.AddChildrenToPage(RectangleRF clip) +193
Telerik.Reporting.Paging.Group.AddChildrenToPage(RectangleRF clip) +171
Telerik.Reporting.Paging.PagingElementBase.AddToPageRecursive(RectangleRF parentClip, Double parentTop, Double parentLeft, Double parentReservedTop, Double parentReservedBottom, Double parentReservedLeft, Double parentReservedRight) +816
Telerik.Reporting.Paging.PagingElementBase.AddChildrenToPage(RectangleRF clip) +193
Telerik.Reporting.Paging.PagingElementBase.AddToPageRecursive(RectangleRF parentClip, Double parentTop, Double parentLeft, Double parentReservedTop, Double parentReservedBottom, Double parentReservedLeft, Double parentReservedRight) +816
Telerik.Reporting.Paging.PageCompositionBase.CollectElementsAndDataForPage() +170
Telerik.Reporting.Paging.PageCompositionBase.OutputPage() +534
Telerik.Reporting.Paging.PageCompositionBase.CreatePages() +828
Telerik.Reporting.Paging.PagerBase.Telerik.Reporting.Paging.IPager.CreatePages(IPageHandler handler, Report report) +42
Telerik.Reporting.BaseRendering.RenderingExtensionBase.Render(Report report, Hashtable renderingContext, Hashtable deviceInfo, CreateStream createStreamCallback, EvaluateHeaderFooterExpressions evalHeaderFooterCallback) +314
Telerik.Reporting.Processing.ReportProcessor.CountPages(IList`1 reports, IRenderingContext renderingContext, Hashtable deviceInfo, ExtensionInfo extensionInfo, CreateStream createStreamCallback) +402
Telerik.Reporting.Processing.ReportProcessor.RenderCore(ExtensionInfo extensionInfo, IList`1 reports, Hashtable deviceInfo, IRenderingContext renderingContext, CreateStream createStreamCallback) +472
Telerik.Reporting.Processing.ReportProcessor.RenderCore(String format, IList`1 reports, Hashtable deviceInfo, IRenderingContext renderingContext, CreateStream createStreamCallback) +49
Telerik.ReportViewer.WebForms.ReportPageOperation.RenderReport(String format, IList`1 processingReports, Hashtable deviceInfo, IRenderingContext renderingContext) +85
Telerik.ReportViewer.WebForms.ReportRenderOperation.PerformOperationOverride() +206
Telerik.ReportViewer.WebForms.ReportPageOperation.PerformOperationOverride() +88
Telerik.ReportViewer.WebForms.HandlerOperation.PerformOperation(HttpContext context, ICacheManager cacheManager) +49
Telerik.ReportViewer.WebForms.BasicHandler.ProcessRequest(HttpContext context) +194
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +188
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69