Hacking r4i works fine one DS lite but only some games load on DSI XL?

[Stoneocean]

I have a DSI XL with the latest r4i Version 5 original. I have the latest update on it to 1.81bMy DSI XL version is 1.4.5E

Here is my problem. Some games work, some don't and gives me just a white screenafter loading. When i try it on my DS lite, all games work?!?! So it's something wrong with the DSI XL?