The RegularGrid1 demo fails when attempting to run with v. 4.7.0 or higher. The output error looks like:
Re-mapping materials to internal indexing system ... Assertion failed: (origIndex < this->mapper.size()), function remapMatIndex, file ../../src/libCD/mat/CDMaterialLabels.h, line 221.
While the regular grid itself was updated for the new material indexing system, the reader was not. As a result, temporary indexes were never generated and remapping failed. This has been fixed and updated for 4.7.1