I believe that there is a bug with HereSphere since the first version that prevents the application from stopping the playback of a video file! As you all have seen this is the normal interface of HereSphere:

This shows HereSphere's UI when no video is loaded or playing. When I playback and stop a video HereSphere gets back to this Dark black UI again. But sometimes when I stop the playback the interface becomes white and extremely bright. It's then very difficult to read the UI and to find your way getting back or selecting another file etc... As soon as you run another video all become normal again. But when you stop the playback it can again give you the bright screen or if lucky get the normal black UI.

Here is how it looks when this happens:

It would be nice to fix this, but I wonder if this is not the same bug that causes HereSphere to crash when you delete a file from SMB source!?

When you hit the stop button, the player will rewind the current video to the beginning. If you're playing a VR video, the background covers your entire field of view. Is it possible the video you're playing just has a white background at the beginning? If you find the UI hard to read, you can make the menu more opaque by clicking on the eye icon at the top left of the seek bar menu. Right now, your menu is set to be transparent.

Thanks a lot for the clarification. I checked the video and in fact the video starts with a white screen. Maybe it would be a good idea to add an option allowing to toggle the actual behavior when we stop the video and an option to simply stop and unload the video.  Nice and useful if it can be implemented easily. Not necessary if it's a complicated thing to do, as their are certainly other priorities right now. The transparent menu is very useful when one tries to adjust and change settings and see correctly at the same time the difference.

It's kind of tricky to implement with how the player currently works, but I'll consider it when redesigning the UX/flow of the app.