I don't know if this is a common occurrence, but I'm building an 8x8x8 LED cube at the moment and I'm in the process of debugging some problems.
First off, there's 64 anode column pins and 8 cathode layer pins. Now, some of the LEDs light up even when the cathode pins are not connected to ground. I presume that indicates a short somewhere, maybe the current is sinking to a logic 0 pin on the latch.
I'm also getting a substantial ghosting problem with nearly all the LEDs when I connect everything up.
But I'm seeing that the LEDs flicker when I put my hand near to some of the ICs on my stripboard. I grounded myself, but I'm still seeing some response.
Can anyone give me an explanation for this?