nope, i've also found that every so often that when i go to load nebula 3 on a channel it clips the meter and stays clipped on the meter. Sometimes audio can still pass thru other times it dosen't. I can save the project and then reload it and its fine. Wierd eh ?
ok, try the reverb version (check that GHOST mode is activate in MAST page) and tell me if you get spikes there. Nebula is pretty heavy on loading and sometimes sequencers doesn't allow a big loading time. Sometimes the reverb version solves this solution, because it's ligher.