Data Modeler is out with plenty of important bug fixes. Go and try!

From the download pages:

Oracle SQL Developer Data Modeler Bugs Fixed

Date: December 2015

This list contains only a selection of higher priority bugs, customer bugs and issues raised by the community on the OTN Forum since the release of version 4.1.2.

22109015 Table structure not available in browser for versioned designs
22120662 “Oracle errors to mask” tab is always disabled
22112910 Table has columns with undefined security properties’ for xmltype column
22186607 Constraint definition is missing in ddl when custom ddl script is used
22187312 Error when running design rules using Data Modeler version