No objects calculated in Skatter for SketchUp

Skatter stops working for me. I use the latest version (1.4.1) for SketchUp (Mac) and I follow the workflow I always did (a few months ago). But now, when I select grass from the library en select the surface no objects are calculated. I reinstalled Skatter and tried different settings, but nothing helps. Can someone help me? Thanks!

There has been an issue with OSX, but a fix has been published. Please try to download and install Skatter again :

Thanks, this is the solution! Topic closed.