Found with OpenDJ 3.5.0 final RC (566523750c522af582d185e7d328d7e4086244f8)
During manual testing of control panel:
- unzip the archive
- set up a server with o=example base-dn, 100 generated entries
- launch the control-panel tool
- export userRoot in cpt-example.ldif
- delete o=example base-dn (Manage Entries > in new dialog, Menu > Entries > Delete Base DN...)
- create a new base dn o=example, importing data from cpt-example.ldif => the pop-up windows hangs in the "creating default indexes...", nothing seems to happen, base dn is not created.