Hello Paul,
Thank you, now I understand you.
I tried to constantly tie the OE pin to Ground...no effect.. still faintly glowing LEDs.
Thank you for your idea with the MAX7219, I never thought about it this way. I have only read, that they are for common kathode....
I will try it the next days on my breadboard.
Nevertheless, to use MAX7219 would imply a new design and etching new circuit board. I would like to avoid it as long as possible.
So maybe there is another solution to my problem.... :~