Aye, thanks for all the info.. you've given me some ideas as to what may be wrong. I have used all of the textures you supplied for building a small house, left them in the libraries\textures folder, and only added 1 single custom texture (a pictureframe with a painting inside of it) .. It shows up just fine in openzone and exports just fine. Upon loading the zone, and zoning in, it shows all the geometry 100% correctly (even the light sources work just fine) .. it just defaults to eq textures for some reason.
Here are two screenshots. The first is viewing the zone in openzone and the second is viewing it in-game. (sorry for the size if they're too big)
http://h37.bounceme.net/eqemu/correct_tex.jpg <- Openzone
http://h37.bounceme.net/eqemu/wrong_tex.jpg <- In-game
The only custom texture there is the portrait inside the little house (as seen). It's a 24-bit BMP named "cypress_picture.bmp" and resides in the libraries\textures folder (along with all the other textures you have distributed). I only used a single instance of a custom texture because I was testing my ability to pull textures in and properly place them (hence trying to map an image to a box to make it look like a raised picture frame).
As you can tell, the "Texture Set" dropdown is blank (as the textures are in the libraries\textures folder and not some zone specific folder). The zone's name is my test zone, "Infernal1".
I've tried dropping the textures I used into a folder (libraries\textures\infernal1) then specifying that texture set in openzone and still the textures don't show in-game.