Version 2.3b (845) Background layer shows blank

It’s suddenly showing nothing, even though there’s something there, I know something is there because I see it in the prievew panel and I see it in the foreground that there is something in the background layer.

I restart Glyphs and it persists like this.

Any active Reporters?

Ahhhh I just realised what happened, I accidentally switched to the “Select All Layers” tool which made it disappear.