Don’t know what a larsen is, but your problem is most probably related to a bug we just fixed (for the upcoming version).
That’s probably the problem. Try: new project, Menu File/Preload, disable “Always Preload”, then load your project. The bug is that when preload is active, all Stacks are activated for preload at once, but are not de-activated after preloading which of course they should. Does that help?