As I'm getting rid of most of my boards, I thought I'd do some quick compares with MAME before I do.
I spotted this straight away. It's the blue section of the screen and it's slightly wrong. As you can see from the video, the blue is *above* the frog on the title screen.
In addition, the top pixels of the bank graphics are *black*. Fixing the blue will probably fix this.
See video below.
Hope this helps.
God, I miss those dark, musty arcades ....