This is strange.
I had a standard sprite font on my layout, just to get the game right.
Now I am updating the spritefont, adjusting the space etc.
It looks alright on the layout. But in the game, the spritefont is not shown.
I have debugged it I know it has a text.
I then deleted the browser cache, and now it is shown.
How can you avoid problems like that if you make updates to the game and users do not know that they have to delete their cache?