Hi,
I seem to have a similar problem that is related to international accents. It doesn’t seem to be a database related problem, I never had this in earlier versions. I’m using 5.0.0 and 5.0.1git.
Some forms accept ö ä è etc, some don’t, like when I’m trying to add an entry for doctors (=Ärzte) in the ACL list it is not accepted. I posted another question some days ago acl accent issues .
A form that does accept these characters and accents does not guarantee it being entered into the database. Some fields are just left empty…