这可能是由于缺少在初始化Forge Viewer时传递的相应参数导致的。在viewer的初始化代码中添加bubbleNode: null,
参数即可:
Autodesk.Viewing.Initializer(options, function() {
var viewer = new Autodesk.Viewing.Private.GuiViewer3D(document.getElementById('viewer'), {bubbleNode: null});
viewer.start();
viewer.loadModel("modelUrn");
});