Unfortunately renkulab.io has not been fully operational since yesterday at approximately 17:30 - we are still trying to pin down the issue. If you rely on renkulab.io you can subscribe to updates at https://renkulab.statuspage.io.
You can still log in and access your project and push/pull to and from GitLab, but the interactive environments and the Knowledge Graph are currently offline.
Apologies for the inconvenience, we hope to restore full functionality shortly!