Thanks for the reply !
* Rhino crashes whenb i start the connection event with an empty file in both rhino and ArchiCAD,
* This happens on rhino 5.13, and rhino 6 on multiple subversions, 6.08, 6.12 etc...
* Yes i have some addons on grasshopper, like panneling tools, weavebird, lunchbox..
* i installed and uninstalled the connection ( clean uninstall) several times, nothing new