You could try this... In your load image command for your matrix texture add a ",1" behind it... It might slow your game down a bit however...
Load Image "YourTexture.bmp",Img#,1
I think the reason there a "lines" on the matrix is because DarkBasic tries to reduce the image size of the texture in a JPG sort of way. Combining the edge of each texture square with the one to the side of it... This will force DarkBasic to load it exactly as it is...
(The Set Matrix Trim should work too...)
Well... I hope I helped...
The computer isn't an addiction, its more of a mental and social dependancy.