okay it crashed again. nobody was able to get past the waiting for server... screen.
I checked the output log. here is the error being spammed repeatedly over n over.
(Filename: Line: -1)
KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2[system.String,ChunkAreaBiomeSpawnData+scl0000].get_Item (System.String key) [0x00000] in <filename unknown>:0
at ChunkAreaBiomeSpawnData.SetRespawnLocked (System.String _entityGroupName, UInt64 _currentWorldTime, .WorldBiomes _worldBiomes) [0x00000] in <filename unknown>:0
at SpawnManagerBiomes.md0001 (.cl0002 par0001, EnumRemoveEntityReason par0002) [0x00000] in <filename unknown>:0
at World.md005f (.cl0002 par0001, EnumRemoveEntityReason par0002) [0x00000] in <filename unknown>:0
at World.md005b (Single _partialTicks) [0x00000] in <filename unknown>:0
at GameManager.Update () [0x00000]