Newly created DMU worksets open in application Gateway, where it was expected that application DMU would have been started.
Replace the template for an newer version of ootb ..\NX\UGII\templates\dmu-workset-mm-template.prt in the TCdatabase.
It seems the old template caused the behavior to not start application DMU.
In paxfile ..\NX\UGII\templates\nxdm_ugs_dmu_templates.pax the tempplates are defined.
Notes