So I tried an empty song tonight, got it up to 13 instances of Helix Native and no problems at all saving and importing.
So I went back to my current project and there it is again, cannot save or import, just before confirmation dialog, I,m back at desktop.
So I thought maybe it's the way Studio 1 handles graphics and I looked in the options menu. Found "Enable High DPI Mode'' at the general tab and unchecked it.
Voila, it doesn't crash anymore. I created a new track and bus and inserted Native. Imported preset and no problems...
I'm happy it works now and I don't think I need high dpi mode at the moment so I hope it stays good this way but for now, this seemed the solution.
Wether it's a bug in Native or Studio 1 I can't tell.....