Round Earth Skeptic

Hi, I had a question about the SSTULabs mod in Realism Overhaul. I can't seem to use the so-called 'modular' SRBs from this mod. The boosters don't ignite, their thrust is listed a zero, and their burn time as 'infinity'. The Real Fuels 'Show GUI' button for the engine doesn't do anything, but I can enter an interface to adjust thrust curves. This also doesn't appear to do anything, however. The non-procedural SRBs included in the mod work fine, so is it something I'm doing wrong, or do the SSTU procedural SRBs just not work with RO/Real Fuels? Thanks very much for reading