Hmmm, I always use .obj file format for exporting Wings models and have rarely had a prob. Make sure you have your Wings window maximized so you can see the blue "progress bar" at the bottom of the screen. A few times I was in a hurry while exporting and thought that the program was done doing the file conversion when in fact it was still working on it. I closed the program and tried to import the .obj into Bryce and got the same message you described. Hope you can resolve the prob.