Hi Gabriele,
Thank you for your feedback with files for testing. Finally we found the reason why layout is broken.
The issue is caused by the problem related with "autoResize=true" property of some nodes. When the file is open, nodes having "autoResize=true" treated as zero size (width = 0, height = 0). Due to this problem all edges connected to theses nodes loss correct positions.
This issue will be fixed in the next minor version (3.0.2 or 3.1.0) that will be released soon.
To fix this problem temporally, please off all autoResize property and fix edges layout and then save the file.
Thanks,
StarUML Team
2019년 1월 25일 금요일 오후 6시 39분 20초 UTC+9, Gabriele Cucci 님의 말: