StoryboardPro20 crashes after dragging elements

My StoryboardPro20 version 20.10.1 crashes after I drag panels, layer or audioclips to change their order. The program shuts down without error warning.
I work on a Thinkpad, windows 10, 64bit, Intel(R) Core™ i7-9750H CPU @ 2.60GHz 2.59 GHz, 16 GB ram. Nvidia quadro T1000.
GPU acceleration is on.
Thanks for help!