I read the post that Ben sent a link for and I will have to check the model origin spot to see how far away it is from 0.0. Interesting to know about though. I would never have thought of that. However I still don't understand why, if indeed that is what's causing the problem in this case, why it does it all of a sudden. If the model was 'flawed' from the beginning, why does it not show up right from the begining?? Why suddenly, out of the blue? One minute all is well, next thing you know it's all distorted.
The way I did the texture on that wall was to initially use the "reapply material" option to remove the texture it had in Archicad, then used an Artlantis wood texture with '0' distortion, and then layered another wood texture from my own library on top of that with a mild opacity to it to blend the two textures. It worked fine everywhere else, but then boom! Just on that one wall it suddenly went screwey.