...Sounds like you just got a bad display, or had a metal shaving or some bit of conductive material shorting out the PCB board. (Since the 'data' is written to screen by pulsing transistors, those two columns were probably shorted out, drawing all current from all the other columns.. Once the short wasn't shorted anymore, the screen returned back to normal. However, those two columns are now dark because they were probably 'burnt-in' and weakend by the always-on from the previous days..)
Contact David, and see if you can return it and grab a new display..
Me.
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Mike 'Fox' Morrey
128BPM@124MPH. Love it!
2002 BRG Mini Cooper