Text in formula panel is reversed

Well, this one is a real doozy! What causes this when I type in message "1"?

That does not happen here. Any chance you accidentally activated a different text input option / keyboard?

I have no idea how it happened Kurt - I wouldn’t know where to start to activate a reverse keyboard action. I’ve not been able to repeat it and I hope it never returns - it gives the compiler a dreadful headache.

Big / Little Endian?