Utau-Synth not making any sound

[Inexperienced]

I have both the Japanese and English versions of Utau-Synth on my computer. A while ago when I was just messing around with it and trying to figure out how the voicebanks work (not really doing much, just trying to make notes form actual words) it suddenly stopped making any sound at all. I have several voicebanks in it both English and Japanese and none of them make any sound when I play the notes back, however one of the voicebanks came with a UST and when I import and play the UST it works fine, but if I put any other notes in whatever notes I put in won't render or make any sound and I can't find anywhere online that says what to do in this situation. At least I can't find any solutions for Utau-Synth.