sparks prefs are not saved whith the opened project , only in a kind of global settings.
the consequence of this is when you modify midi mapping(in gm or spark mode) on a project and open older project realized whith other settings, sparks behave not correctly. you have to retrieve the correspnding setting and do it every time you switch between different projects.
the host is Nuendo.
another bug is the Spark track by default is named "-1".
bad bad bad.