@eneroth3 said:

<offtopic>
There's a Materials.current method 😲 ?? For my latest project I created a materials observer listening to active material change just so it could be assigned to a variable so I later could know what material is active. How could I have missed this? 😳 cleaning up some code
</offtopic>

Beware that the material might not be in the model yet - in older version of SketchUp it can cause crashes if you try to apply the material to entities.

@dan rathbun said:

Attach a model observer and provide onDeleteModel and onEraseAll callbacks that output something to the console.

Thanks again!

onEraseAll does fire on Windows when opening another model, but not on OS X unfortunately. Interestingly enough, I also can't get it to fire on erasing all objects. onDeleteModel doesn't seem to ever trigger. I'll focus on other issues for now, this one can wait.