Have the same problem, Local Storage: i18nextLng - de, nothing in Session and Cookies. Cleaned the Storage, nothing happens. In Console I have the following errors:

DevTools failed to pa**e SourceMap: http://192.168.1.99/static/css/main.a049ccfe.css.map
DevTools failed to pa**e SourceMap: http://192.168.1.99/static/js/main.666b1be8.js.map

I have problems with Dreamcast emulator too. It plays only windowed, not in fullscreen. I had to set the config to CEA 16. It there a other way to play in fullscreen? I reset the config to get a clean one, but nothing changed.

I paired a Wii U Pro Controller and a Wii Remote Plus. The Wii U Pro Controller has a delay (around 1s) when pressing any button. On the Wii Remote it was impossible to map the joypad, only up and down worked, no left or right. I juse the internal bluethooth on the ri3.