My mistake! (It's been so long since I set this up, I forgot you need to point at tree.cfg with a config option.) Just to be clear, as Dimiel and Lucio pointed out, you need to use the config option mdl_tree_cfg_file. So, if, for example, you save your tree.cfg file in the directory C:\PRO_SETTINGS, you need to add the following line to your automatically loaded config.pro file: mdl_tree_cfg_file C:\PRO_SETTINGS\tree.cfg