Hi, after resolving the locking problem with the communication and testing up-and downloading to and Orthanc server I can not confirm the bug, that is, after a round-trip the images don't contain any bogus tags.
This holds for the combination of Ginkgo CADx and Orthanc available from jessy, and for the current Debian/sid version of Orthanc in combination of Ginkgo CADx as of [1]. Best, Gert [1] https://github.com/gerddie/ginkgocadx/commit/eb1bc1
