btw did you try to load them as Images, using LoadImage() ?
And you don't need to use square textures in blitz, but the width and height needs to be "powers of two", aka 2,4,8,16,32,64,128,256,512,1024 while width and height don't have to be the same.
I still think it's some kind of unsupported JPG format. Maybe it's even Windows that thinks the JPG is a virus...
Suggestion: convert the JPGs to BMP and try to load them.
And you don't need to use square textures in blitz, but the width and height needs to be "powers of two", aka 2,4,8,16,32,64,128,256,512,1024 while width and height don't have to be the same.
I still think it's some kind of unsupported JPG format. Maybe it's even Windows that thinks the JPG is a virus...
Suggestion: convert the JPGs to BMP and try to load them.