Trying out the examples of your beautiful tree on my brand-new Leopard install.
It looks that Safari 3 on the Mac has does not support context menu?
(dhtmlx.com/docs/products/dhtmlxT … _menu.html)
Problem confirmed and fixed - we will update menu package in nearest time to resolve issu , if you need fix ASAP - please contact us directly ( support@dhtmlx.com ) we will send you fixed version of menu.