I think both of you where right. I did play with the pause last night without much success, I replace the resistors with 50 ohms one, now it works better (still not perfect) but at pauseus 50, I still get flickering and a lot of ghosting, many segments of the display that should be off, fades on and off which do not occur at slower speed ( pause 10 lets say).
I raise the voltage to get light emission, but that problem seems worst !
any ideas how to eliminate this?