Just to provide a little more insight for others assisting with the debug, here are a few snapshots of the OP's display from a video he sent in. Might be helpful to post a link to the video but this show's some of the main issues.

The credit and score information is sent from the CPU to the Whitestar display controller. You can see this information is being corrupted somewhere between the two boards. The CREDITS text is incorrect and the high scores and replay scores end in nonzero digits.

The easiest/best way to narrow down the problem is to try a different display board. There might be someone local to you that would be willing to lend a board to try.
Whitestar1 (resized).pngWhitestar2 (resized).pngWhitestar3 (resized).png