[Lawrie]

Not sure if this is related as I don't use full screen mode (I like to have the time etc. showing), but since the most recent Boox TabX firmware update I've had odd things happening with the status bar, most often it will change to a white background while leaving the text white too <edit> when turning Bluetooth or the front lights on or off. </edit>  A little later it will rewrite <edit> again<edit> and go back to normal.
I'm hoping the upcoming change to a black on white status bar will mask this.
I have reported this to Onyx but haven't had a response.

PS it was definitely the firmware update that caused the problem.  It happens to another app too.