Modeler convert problems: 5.18 to 5.20

Hi! I'm experiencing a weird problem. I just updated the business modeler from 5.18 to 5.20. At first, my app still works like always. Untill I click a random action-button: then nothing happens. It seems quite arbitrary whether a button works or not. Did anyone else run into this problem? Or does anyone know what the cause may be? Thanks a lot! Marieke
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