Uh if I remember right you need to have a start balance in your backpack (can be 1gp) when you start the script in DP. I think it has to do with the NPC on Shadowcores/Lunarforce and the dialogue. It's not exactly the same as on real tibia. I think it's when you say "deposit all" and you have no gold on you it stays on that sentence and then when you say withdraw it fucks up somehow, I don't really remember exactly.