Synthesizer V Studio doesn't seem to render vocals.

So after creating a VSQx in Vocaloid 4, and importing it into Synthesizer V Studio I have no sound at all due to the editor not displaying the timings below the notes. Is there a way to fix this? I’m using the latest version of the Basic Editor.

Try using Utaformatix to convert the file instead of the built-in import tool:
https://sdercolin.github.io/utaformatix3/