Some GTL code generated by the Designer can not be run with PROC SGRENDER. For example, "computed" plots such as boxplot and histogram are not yet supported in GTL datalattice/datapanel layout. In the production release of the Designer, you will see some comments in the code indicating that it can not be run with proc sgrender. However, you can always run PROC SGDESIGN in batch mode for any output generated by the Designer.
Thanks,
Lingxiao