Chony, I don't own a T4 (yet?) but my T2 requires me to use the Save button in Style Creator 'Assembly Tab', to successfully Save a style. I'm unable to reliably successfully use Save in the 'Basic tab' .

If this is what you're experiencing on T4 too, then perhaps this is simply a longtime frustrating PSR/Tyros OS glitch which has simply never been addressed. Unless or until Yamaha addresses this, simply use the save button in Style Creator 'Assembly Tab'.

Good luck,

Scott