Labels not showing up in SSRS report


I've successfully installed and configured SSRS to develop reports in AX2012. I made some modifications to SalesInvoice, deployed it and the modifications work. However, when I run the report from AX2012 the labels show as Labels!@SYS13864. But when I open the report in Visual Studio in design mode and select "Preview", the labels do show up! I've restarted the AOS several times and did a succesful full CIL compile.

Any ideas?