We have several .rdlc reports and use a well-known ReportItems technique to show some master data information in every page. In other words, we add a hidden textbox to the body and use that textbox to show the data in the page header.
Recently, we migrated our solution from VS 2008 to VS 2012 and upgraded framework to .NET4. After conversion of reports to new Tablix format, we saw that this workaround solution doesn't work in VS2012 with new report (tablix) format. We tried several things but couldn't find any solution. I tried to explain the problem in the pictures below.
In addition, I downloaded a sample application from gotreportviewer.com and using it I prepared a working demo solution with VS 2008 and converted it to VS 2012. If you want to dowload working and not-working solutionsyou can download them here.
Do you have any idea?