export mixer configuration

Hi Prock
the template works fine for new projects…window layout etc get applied but not mixerconsole settings.
The issue is that mixer configuration does not seem to work for older projects.
If I import an older project the mixer(s) will (for example) show all channels…while I need say only fx/groups and outputs.
In other words mixer configuration is not applied to old projects and configuration has to be set up again and resave project.
A bit of a pain.
I might be missing something so help is much appreciated.
thanks