verolgnirts said:

PC System requirements are met as requested but nevertheless the game doesn't charge correctly in the "webgl" modus.

Charging get's stuck on 72% - 88% - etc.. and very sometimes the screen charges completely but in a strange resolution where some options work and others just complete freeze the game completely so this eternal charging (page refresh) has to be done all over again with no garantee to success.. 
The beta version or test modus should be used in a test environment first and not with actual players.. like myself.
Or a roll-back to the old interface or a working new one is needed as this is making it impossible to continue playing.

Thanks up front Plarium for proposing a constructive answer / solution soon.

Please make sure that Web GL support is properly enabled on your browser: https://www.laptopmag.com/articles/how-to-enable-webgl-support-on-chrome-for-android

Before that update Chrome to the latest version and disable Flash plugin for Sparta. Also let me know if you have Windows x32 or x64.