Hey, I'm having trouble as well.
I've got the garbled graphics issue, but not on all games.
The jumpers are pretty messed up (I cut it up too much, because measurements kept showing a shorted connection), but when measuring the points they seem to check out okay.
Something I don't understand:
Some games I tried work perfectly. Mighty Pang, SF Alpha, Rockman Power Fighters 2, all from the old (decrypted) Smokemonster Pack worked, as well as the Punisher Conversion. Loads of other games (like SF2T, Progear, Ecofighters, 19xx, etc) from the old Pack didn't work correctly, however. Weirdly, all of the games that worked decrypted did not work encrypted!
Of course I wired up the key write wires; measured the connection too and it seems to connect fine. The LED is solid green while it's writing the keys.
Using a PAL G and a Rev 7 B board.
I uploaded pictures of the problem, the jumper mess and the key wires here:
https://imgur.com/a/M3ZF51O
I'm completely out of ideas. If the security was the problem, shouldn't all old games work? If the PAL was the problem, shouldn't I have sound problems rather than graphic corruption? If the jumpers are the problem, why wouldn't both versions of SF Alpha work?