(I posted this as a support ticket, but other users need to be aware, until this is fixed, that the upgrade process to Q1 2013 currently has major flaws so also posting it here).
Since I upgraded to Q1 2013 of Telerik Reporting, not only has my toolbox been messed up in Visual Studio 2012 (I can't see any Reporting controls, and Resetting the toolbox hasn't helped), but I can't add any data sources, and my previous projects (which used 2012 Q3 Telerik reporting) don't work any more: I just get a Loading ... title page when trying to view a report in a previous project.
Please help urgently, as this the installation documentation (and upgrade process) is clearly faulty/inadequate and I can't do any work on reporting aspects of our projects until this is fixed!
Thanks