Having the same issue. Windows 10. Everything up to date. Using Cubase 10.
I can load the Synchron Player VST 3 (Rack Instrument). When the player comes up, I can double click to load Synchron Strings or Smart Orchestra but it will crash as soon as I send it some midi data (sometimes creates a dump file, sometimes just takes down Cubase with no dump file). I can however load it within VEP6 and everything works. It does not seem to like being loaded in the DAW though.