Hi Marky,
we’ll definitely fix it, but for now we can’t reproduce it as it happens in some special circumstances for just a few users.
The exception definitely is catched here
UE4\Engine\Source\Editor\SwarmInterface\DotNET\SwarmInterface.cs in line Log(EVerbosityLevel.Critical, ELogColour.Red, "[Interface:OpenJob] Error: " + Ex.Message);. It would be great if you could change this line to Log(EVerbosityLevel.Critical, ELogColour.Red, "[Interface:OpenJob] Error: " + Ex.Message + "\n" + Ex.StackTrace);, rebuild the UE4\Engine\Source\Editor\SwarmInterface\DotNET\SwarmInterface.sln solution and resend the log after reproducing the bug. This will tell us more.
Thanks,
Jarek