Dear Piotr,
Thank you very much for the report and I am very sorry about the experience!
Before diving deeper, may I ask whether the issue persists when you save the Teamwork file as a local PLN/PLA copy?
If the issue only happens in Teamwork, then it might be difficult for me to investigate further. I saw that you have contacted your local support. What was the result?
Looking forward to hearing from you!
Best regards,
Minh
Minh Nguyen
Technical Support Engineer
GRAPHISOFT