Thank you for your comments. It seems to be a Linux-specific problem. A colleage from CADFEM contacted me and he is trying to reproduce the problem.n

Can you check everytime if (udf/libanme) is set to the right thing.https://forum.ansys.com/discussion/comment/108130#Comment_108130

Yes, that works, as I wrote. But I think it should work without the need to reopen the solver or to reload the case file.n