There are some shapes grouping issues. Attached example contains 3 tests in AsposeTest class , one for each issue:
1) multipleGroupsTest - throws exception with message “com.aspose.diagram.DiagramException: Please ungroup the shape before grouping shapes” while creating second group on the page
2) groupDisappearsTest - shapes in group became invisible
3) invalidConnectorMasterTest - throws exception with message “com.aspose.diagram.DiagramException: Shape DataRow.51 with ID {1} is not a Dynamic connector” while connecting shapes with connector(“Dynamic connector” master is used) after adding shape groups on page
Attached example works with Aspose Diagram version 16.10.0 , but 16.10.1 has the same issues.