Hi CumbersomeCormorant74 yes, this is almost the scenario: I have a dozen of projects. In one of them, I have ~20 archived experiments, in different states (draft, failed, aborted, completed). I went to this archive, selected all of them and deleted them using the bulk delete operation. I had several failed delete popups. So I tried again with smaller bulks (like 5 experiments at a time) to localize the experiments at the origin of the error. I could delete most of them. At some point, all of them disappeared , so I was happy - I closed the archived and then I realized no experiments in the project as well. First I though I accidentally closed the archived and deleted others experiments as well, but then I went back to the main page I here all projects were showing 0 experiments, they were all empty, including their archives