.dll via JNA

My aim is, to control a Multi-IO-board produced by Velleman (Belgium) with Greenfoot-based software. My hope is based on the scenario "sensboard test" published in documention. Status of development: my code shows no syntax errors. BUT: the world (Panel) does not start. It starts if I switch off all lines concerning JNA or native loader. If I switch on only the static method "native loader" in World "Panel" it doesn`t start. If I switch on only the K8055D instance called "bord" it starts but the test run says: . The scenario is published under "GF KD8055" post number "10101". The critical lines are put to comments, to see anything. Put them active to face the problem. I hope somebody can help.... greetings and already thanks of Yogibaer