@Jimbodiah Your suggestion is correct; I had only the FancyMouse replacement RemoteTech.dll file in the plugins folder for RemoteTech and like @Fizbanger and @Matrix_kbh the dll alone actually broke a bunch of stuff. However once the ModuleRTDataTransmitter.cs file was included in the folder, transmitting researched science from the Advanced Science Laboratory and the MPL works again and the bugs seen without the .cs file also resolved. I haven't spent time playing with the replacement dll beyond this - but at least for now it seems all good! Thanks all!