Seahub don't restart after change logo

Hello !
When I try to change the logo of seafile, seahub don’t restart and I need to create a new seahub_settings.py for running it. What can I do ?
This is what I add :
LOGO_PATH = ‘custom/logo.png’
LOGO_WIDTH = 176
LOGO_HEIGHT = 181

Hi. What are the permissions of the custom folder and config file?

custom folder : drwxrwxrwx
seahub_settings_py : -rwxrwxrwx