I seem to be unable to fill my RCS fuel containers (such as Stratus-V monoprop tank, AIES MS-1 RCS Fuel Tank, SA-1 etc) with any kind of fuel in the VAB. When I right click, there is no option for selecting a fuel, and when I try to launch, no appropriate fuel type shows up in the upper right hand corner list of resources. This occurs whereever I place the RCS thrusters (AIES SN-1 micro RCS thrusters), whatever RCS fuel I set them to, and whereever I place the RCS fuel containers on my rocket. I am using the Realism Overhaul mods, including the newest versions of Real Fuels, Engine Ignitor, ModuleRCSFx, and CrossFeedEnabler, and the RftS engine pack. Any tips on how to get this working?