OK, thanks for the update.
If it happens again, please capture a diagnostic log as follows;
1. From the Finder, select Menu -> Go -> Utilities.
2. Launch Activity Monitor
3. Select VinylStudio in the list of running programs.
4. Click on the gear wheel icon in the Activity Monitor toolbar and select 'Sample Process'.
5. When sampling is complete, click 'Save' to save the results to a file and send it to me:
p DOT sanders AT alpinesoft DOT co DOT uk
I will then take a look.