IF you are using Windows (10 or 11), there's a built-in 3d model viewer. Exporting OBJ out of poser, for me, produces a result that opens correctly with textures in this model viewer. You can try opening the exported OBJ in that model viewer to see if it looks correct, If not, then the problem would appear to be Poser export settings. If it does appear correct in the Windows viewer, then it suggests there's a problem with the Truview importer (despite it working from other program exports, it's just a first experiment to discover the nature of the problem).