Version 1.0.4, Synth V Studio always quits shortly into playing my file, regardless of voicebank chosen or file imported.
Oddly, it works just fine when no voice is selected, only when I select the voicebank does it begin quitting suddenly.
Check for updates and upgrade to SynthV version 1.0.8, then try again.
If the problem persists, it is recommended to upload the project file here for official inspection.
(Translate with translator)
「いいね！」 1
Upgraded to 1.0.8; so far problem has only shown up once, however I suspect it was simply due to once particular. The problem does not seem to persist with any other of my Vsqx or midi files now. Thank you for your help. 
「いいね！」 1