texture with alpha layer in GL scene

i'm struggling to get the alpha layer of png files i'm using as textures to work as expected... it's probably something quite simple that i keep on missing, but at the moment it seems like it's not drawing correctly.

there are 2 possible causes i can think of at the moment:

1. wrong blend mode applied to objects / texture

2. something to do with draw order, which i'm not sure how to tackle when using jit.gl.multiple... (draw raw?)

any insights would be greatly appreciated, i have attached the patch in zip format, with demo png file for texture.

justin