It was mentioned that this.chat was automatically hiding after 3 seconds, it also seems that once it gets hidden like this it will not display the next time this.chat is set.
Without using opengl it seems as if all emitters are displaying the equivalent of 2 or 3 tiles higher than they should be.
I was testing a few things on a trial and noticed another level display issue as a result of entering Observer Mode and the screen focussing on a player several levels away:
The black square was much bigger than this and had correctly animated flower tiles within it originally but I couldn't screenshot it quick enough, it was without opengl again however.