It appears I’m experiencing a similar issue as described in:
When I configure the DataSource as “dicom-web” OHIF plugin v1.2 works just fine, but it somehow clobbers the images when I switch to “dicom-json”. Plus, it only shows 1 or 2 instances out a series with 40+ instances.
Note that this might be an issue within OHIF, as using dicom-json as a DataSource should disable the parsing of the DICOM files by Orthanc (contrarily to the dicomweb data source).