Just tried to print with yam with a laserjet4 to see off that would work...no.
But now I can't go back to my old settings.(usb epson)
It just won't save my setings.
I removed the laserjet4 but it still is coming up as installed under the printericon in the configuration window.
Where does morphos saves his settings off the system?
So I can delete it and try again.

sys:Prefs/env-archive/sys/

turboprint:configs/

You should probably reboot when you delete the settings.