find the line near the top (line 41?) that defines the string "current_character".
Change it to be TWO spaces long, rather than 1, like this
string current_character = " "; // empty space
Im sorry but I couldnt find out WHAT actually changed in A7.50 to 7.60 to cause this.
But str_cpy changed the way it truncates strings if the target is shorter than the source.
I couldnt find any reference to this in the change logs though...