<Solved - it was file permissions on the key JSON files> I’m trying to administer a remote server that others have been using for some time (so there are a large number of tracks/vehicles available and packages/rfmods we’ve used successfully in the past). There are two main issues - I can only successfully launch a race weekend if the track in question is the official S397 Le Mans (v2.51) one. I can launch existing raceevents based on this track or create my own package and use that. I *cannot* successfully launch a raceevent based on any other track I’ve tried - the dedi server dialogue closes a few seconds after trying ‘Load Track’. This goes for pre-existing raceevents and any I try to create. All assets (tracks, cars, mods) are present and correct. The second issue I have is that if I do get a race weekend up and running and then exit the dedi server manager, the race weekend remains visible to clients via the matchmaker list but clients will get an error after a timeout if they try to join. In addition, an rf2 process remains running on the windows server - killing this removes the race weekend from the list of visible races in matchmaker. It may be a coincidence, but the last track we used on this server when the previous admin was running the show was…. ….S397 Le Mans… Any ideas - principally relating to why no other tracks appear to work.