Mine were reset to blank too, file permissions are fine. I got this error this in the log the first time after installing your most recent version. It was only the first load, subsequent loads have no errors and don't remove maps anymore. [LOG 01:36:02.626] Kethane plugin - deposit load error: System.Runtime.Serialization.SerializationException: Could not find type 'System.Collections.Generic.KeyValuePair`2[[System.String, mscorlib, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Kethane.KethaneDeposits, MMI_Kethane, Version=1.0.4900.26440, Culture=neutral, PublicKeyToken=null]][]'. at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadType (System.IO.BinaryReader reader, TypeTag code) [0x00000] in <filename unknown>:0 at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadTypeMetadata (System.IO.BinaryReader reader, Boolean isRuntimeObject, Boolean hasTypeInfo) [0x00000] in <filename unknown>:0 at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadObjectInstance (System.IO.BinaryReader reader, Boolean isRuntimeObject, Boolean hasTypeInfo, System.Int64& objectId, System.Object& value, System.Runtime.Serialization.SerializationInfo& info) [0x00000] in <filename unknown>:0 at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadObject (BinaryElement element, System.IO.BinaryReader reader, System.Int64& objectId, System.Object& value, System.Runtime.Serialization.SerializationInfo& info) [0x00000] in <filename unknown>:0 at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadNextObject (BinaryElement element, System.IO.BinaryReader reader) [0x00000] in <filename unknown>:0 at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadObjectGraph (BinaryElement elem, System.IO.BinaryReader reader, Boolean readHeaders, System.Object& result, System.Runtime.Remoting.Messaging.Header[]& headers) [0x00000] in <filename unknown>:0 at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.NoCheckDeserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler) [0x00000] in <filename unknown>:0 at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream) [0x00000] in <filename unknown>:0 at KSP.IO.IOUtils.DeserializeFromBinary (System.Byte[] input) [0x00000] in <filename unknown>:0 at Kethane.KethaneController.LoadKethaneDeposits () [0x00000] in <filename unknown>:0 [LOG 01:36:02.632] Generating new kethane deposits If I look at the new Deposits.dat it has Version=1.0.4901.4880 and my 0.19.1 version has Version=1.0.4823.40595. It seems like generated deposits aren't compatible between your new builds of the plugin dll and the previous official release.