When opening a report designed in the Report Viewer, everything is working as expected. When trying to print or export it, a message is shown that an exception occurred: "An error occurred during local report processing".
An issue was addressed in the Report Viewer module where the usage of unsigned values could cause misbehaviour of the printing/export mechanism in rare cases. Now, all integer variables for RDL must be signed.
Fixed on 08.05.2012, available from 7.00 SP0 Build 1