The only thing I could determine is that it has something to do with the number (87) of parameters you are saving in the presets. I took an otherwise fully working plugin, and increased the number of parameters from 4 to 100 and ended up with the same problem. It is not a saving problem because all the values are saved correctly to the registry. There must be a limit somewhere on the number of parameters (when it is populating the list) that is causing the problem. Maybe Max or Eugene can shed some light on this.