Problem with linkage starting from 1.5.x

[toka]

If you link the roundcubemail-1.5.1 directory (ln -s/opt/www/roundcubemail-1.5.1/opt/www/roundcubemail), the interface stops working (folders and settings are not displayed). If you specify exactly the roundcubemail-1.5.1 folder in apache2, everything works. It is necessary to clarify this effect. In versions 1.4.x everything worked.