If I load a previously saved object export configuration in the cart export, the DDL and file format parts are applied correctly. But the files settings wouldn’t load in this case. My saved settings has compressed checkbox field unchecked and this is also can be checked by looking inside the XML file with saved settings. But if I load this file the checkbox is still checked here. This is probably the cause for the rest of misbehavior, because the file path is also stays unchanged. To change this one you should change the save as value from separate files to one file and back again. I could test this with SQL Developer 17.4 and 18.1, this can be reproduced on my side.