Created attachment 372945 [details] First picture is OK, second one with altered charactes. Non ASCII characters in Bussines, Company Name, Address, Contact Person are changed when Apply or OK pressed. And then incorrect data goes to invoice.... See the attachment!
This also happens on GNU/Linux, GnuCash-3.1, mariadb-10.3.8. It looks like the backend DB data (mysql in my case) is correct. This is how to restore the value: mysql> update slots set string_val = "first addr line second addr line third addr line" where name like "options/Business/Company Address"; (the collation of the relevant column looks correct: utf8_general_ci) However the Book Options won't render UTF8 chars, so the bug seems to be on the GUI side.
*** This bug has been marked as a duplicate of bug 796754 ***
to be more precise