Hi there, I'm just getting to grips with (and loving) the layout node in Solaris and wondering how I'd go about updating an asset once it has been laid out? Or for that matter swapping it out for another one so I don't have to lay them out again. Many thanks

Being able to modify an existing "layout" (point instancer) is not currently supported. It is something we're looking into for the next release of Houdini. For replacing one asset with another you can use the "Edit Prototypes" LOP (which changes which prototypes are assigned to which instances in a point instancer).