Hi Nicolas,
Let me make sure that I understand what's the issue here - you click on the domain and on the Images sub tab nothing is displayed?
Can you please clear your engine log, click on the ovirt-image-repository domain and attach the log to the mail?
When I do it, I get the following audit log:
2018-03-13 07:19:25,983+02 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-86) [6af6ee81-ce9a-46b7-a371-c5c3b0c6bf2a] EVENT_ID: REFRESH_REPOSITORY_IMAGE_LIST_SUCCEEDED(998), Refresh image list succeeded for domain(s): ovirt-image-repository (All file type)
Maybe you get an error there that can help us understand the problem.