[BitBucket user: Thibault Nélis]
[BitBucket date: 2016-12-12.15:52:55]

It might also help to start Orthanc in `--verbose` or `--trace` mode, and search both the browser console log and the browser requests history for clues. We can help analyze them if you're willing to post them here. Maybe try other backends for index and storage if possible in case it's somehow related, this might help isolate the issue.