Well, you probably created that runtime by just adding the Pixelsquash folder. But Poser doesn't create a correct runtime structure then (and support just says that the user is supposed to create the correct structure beforehand, rather than adding a few lines of code to correct that problem - but that's another story ;-)). But without a Runtime folder inside the Pixelsquash runtime, your references aren't correct (and well, without a runtime folder, where's the textures folder here anyway?). Remove the runtime inside Poser, create a folder named "runtime" inside the pixelshash folder, move the libraries folder inside that. Keep the "textures" and "geometries" folder inside the runtime folder, too. Add the folder back. It should then look like that (and work):