@dr.fornax I suspect you're calling resizeColumnsToFitContent() too early, before the TreeTableView has received it's skin. The function tries to detect that this is the case by checking the skin before running, but all it does is delay it to the next pulse. We could easily change this to listen for when the skin is actually available, so if you could post the code that fails I could verify that this is the case, as well as verify that my fix would solve it 🙂