New 64 x 64 panel - alternate groups of 16 rows displaying

[bidmangler]

I'm hoping for some pointers about where to start troubleshooting.

Update: Solved. the E address line was on Pin 8 after all - I was just counting the pin numbers on the Hub75 connector wrong.

I'm working with these panels from a company called "Seengreat" - https://seengreat.com/wiki/74/rgb-matrix-p3-0-64x64 . I've also built a bunch of the level-shifting adapter boards from this project so I can use multiple chains. From the panel documentation, I've deduced that its ABCDE addressing - with E on Pin 4 of the Hub75 connector. I set the jumpers on the adapter board accordingly.

Just trying to run a basic demo at this stage with just one panel connected to chain 1 but get the problem you can see in the photo. I've tried different multiplexing options but no joy.

Any ideas? How would I be best to go about troubleshooting this? I did check all the info on the page - and looked for relevant issues but nothing jumps out at me I'm afraid.

Thanks folks!