I'm running KSP 0.25 with Interstellar 0.13 and the fusion reactors are giving me grief. In sandbox mode, none of the fusion reactors generate thermal or charged power. Same problem from the 3.25 m Tokomak down through the 0.75 m Kiwi. I haven't tried in science or career mode yet. I was messing about in sandbox mode and built a very basic ship. Fuel tank, 2.5 m tokomak, thermal rocket nozzle. And a couple of heat radiators and D-T cryostats for fuel. On launch the reactor is inert. There's an initial fiddling amount of thermal power, charged particles and waste heat produced but <5% and never increases. Radiators dissipate the waste heat to 0 almost immediately. Right-clicking on the reactor brings up: Active: 100%, 0% cp, 0% th. My first attempt was even worse. Launching the ship caused most functions to lock up. Not a complete lock up of KSP, just many normal functions. The "stage" light stayed red, action groups didn't work, staging didn't work and even trying to retract the "gear" (nonexistent but there's an indicator anyway) did nothing. Had to revert to VAB. Starting a new game fixed that, staging now works normally but reactors are still dead. Thermal rocket fires but provides 0 kN thrust (big surprise, there's no power). Standard fission reactors work fine. No problem there. Ship launches and crashes as usual due to low TWR. I've tried deleting the WarpPlugin folder (and all Interstellar folders) but no improvement. I'm running a number of other mods but nothing that should obviously interfere. Thots? -S