silent

So I made a UST then I saved it, and it was working fine before I saved, but now it's silent; it won't make any sound! Help-

So I just downloaded and installed utau. I changed the system locale, made sure the dot and decimals were in the right place, and I can make Defoko sing. However I can only make her sing "A" and if I try to change the lyric by typing in the lyric bar, or manually, it doesn't work and just greys...