I was approaching my Mun station with a re-supply ship and as soon as I undocked the tug and switched to it my log immediately began filling with: [EXC 11:48:36.817] ArgumentOutOfRangeException: Argument is out of range.Parameter name: index System.Collections.Generic.List`1[StageGroup].CheckIndex (Int32 index) System.Collections.Generic.List`1[StageGroup].Insert (Int32 index, .StageGroup item) Staging.addStageAt (Int32 index) Staging.AddStageAt (Int32 index) TweakableEverything.ModuleStagingToggle.SwitchStaging (Boolean enabled) TweakableEverything.ModuleStagingToggle.LateUpdate () I didn't notice any slowness or lagging at first but after 10 minutes of juggling cargo around, with the exceptions spamming the log, the game became unplayable. Log: Here