Need help with loading resource wad into a wad with custom textures in GZDoom Builder

Hey guys, I was planning to make a map for DMP2014, I decided to use custom textures like the ones that were used in the jungle maps in scythe 2 and brotherhood of ruin.

Here it is in the editor:



Here it is in ZDoom:



Here it is in GLBOOM +



Here is how i set it up:



Anyone know what is going on or how to fix this?

I suspect there's more than one TEXTURE1 lump being loaded, which is no problem for ZDoom since it will read both and merge their contents while GLBoom+ only uses the last lump loaded, which doesn't appear to contain that custom texture. Simplest solution is to add to your map wad PNAMES and TEXTURE1 lumps which contain the default IWAD resources plus your custom textures, which should work fine so long as that wad's loaded last.

Thanks for the advice, I might have a look at that if I find anymore time tomorrow.