[How to Fix]User freezes after character creation (Multichar)

When our users create a new character in the Mulitcharacter system, they can first enter their name, age, etc. As soon as they press submit the skin menu appears briefly, after 2 seconds it disappears and the user stands frozen in one place. After a rejoin the character is there, but only with “Standard” clothes, also called “Calliou”. We have already tried several solutions, but nothing has helped.
I would be very happy if someone here could help us!
Many thanks in advance!

Hi!
It would be interesting to know which system it is? Do errors occur with the client or server?

Would be important details.