In case anyone else runs into this issue, I have managed to fix it on my own. I ended up renaming all of my devices in the ISY to remove any spaces, then also added 10 more integer variables (I only had one) and 10 state variables (I had 10). I’m not entirely sure which fixed the problem, but I’m leaning towards the variables. Anyway, since making those changes, the ISY994 devices load successfully, every time, even after a myriad of changes to my configuration.yaml file and restarts.