I found the science transmission bug [R&D]: No Science Subject found with id sciencelab@Mun as well, but without the antenna range plug-in. The only add-on that I am currently running is DebrisFix. The Communotron is extended and the science transmission registers up to 100% (twice), yet no science is transmitted and the antenna remains extended and transmitting. Aborting the transmission only progresses to have a perpetual "aborting transmission" message replacing the "transmitting" message. The antenna is on a docked rover. If I disconnect and/or reconnect the rover, there is no change to the antenna status. Here is a copy of a section of the Player.log (Mac OS 10.10.3). [R&D]: No Science Subject found with id sciencelab@Mun (Filename: /Users/builduser/buildslave/unity/build/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56) NullReferenceException: Object reference not set to an instance of an object at ResearchAndDevelopment.GetScienceValue (Single dataAmount, .ScienceSubject subject, Single xmitScalar) [0x00000] in <filename unknown>:0 at ResearchAndDevelopment.SubmitScienceData (Single dataAmount, .ScienceSubject subject, Single xmitScalar, .ProtoVessel source, Boolean reverseEngineered) [0x00000] in <filename unknown>:0 at RnDCommsStream.submitStreamData (.ProtoVessel source) [0x00000] in <filename unknown>:0 at RnDCommsStream.StreamData (Single dataAmount, .ProtoVessel source) [0x00000] in <filename unknown>:0 at ModuleDataTransmitter+.MoveNext () [0x00000] in <filename unknown>:0 (Filename: Line: -1) [CurrencyConverter for Unpaid Research Program]: 0 Reputation taken, yields 0 Science (Filename: /Users/builduser/buildslave/unity/build/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56) [CurrencyConverter for Unpaid Research Program]: 0 Reputation taken, yields 0 Science (Filename: /Users/builduser/buildslave/unity/build/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56) [CurrencyConverter for Unpaid Research Program]: 0 Reputation taken, yields 0 Science (Filename: /Users/builduser/buildslave/unity/build/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56) [CurrencyConverter for Unpaid Research Program]: 0 Reputation taken, yields 0 Science (Filename: /Users/builduser/buildslave/unity/build/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56) [CurrencyConverter for Unpaid Research Program]: 0 Reputation taken, yields 0 Science (Filename: /Users/builduser/buildslave/unity/build/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 56)