We are having the same problem IsoDraw V. 7.0 with varying results. First, we realize that by placing the file, we are unable to modify features (nothing can be cleaned up, detail such as tangent lines cannot be reduced, nor can line thicknesses be altered.) This is unfortunate, but we're willing to live with that drawback in exchange for automatic model updates. Second, our department is using PDM Windchill Version 9. Until IsoDraw can access PDM, we have to initially export the ProE file as an IGS file. We placed a test model and exploded parts per our typical standard. We then tried a couple tests to see if updates would be successful: Test #1 - feature in model is modified (example, we added a hole through the surface of one of the parts) Result: A series of things happened. First, the location of exploded parts were randomly impacted (in our example, the location of two parts swapped and were shown with incorrect installation positions.) Second, we removed the feature and saved to 3D model. This resulted in everything returning to the correct exploded locations. Third, we added the feature again, and everything updated correctly. Further testing had the same unpredicatable results...sometimes it updated correctly, other times not. Test #2 - part is added (example, we added an additional screw) Result: All parts previously exploded return to the original assembled state. In summary, we are finding the following to be true: 1. Inconsistent results with generating model updates if part features are modified (sometimes works fine, sometimes randomly reassigns locations of exploded parts). 2. All parts reassemble if one or more parts added. 3. Since editing breaks the link to the IGS file, nothing can be cleaned up, detail cannot be reduced, nor can line thicknesses be altered. I have heard that some companies use low resolution models as their source data. Would this be beneficial for translating data? Could it be that by using the high resolution models, we are asking IsoDraw to work with too much information, so exploded parts are just reassembled again? Has anyone had similar problems and found a solution? Thanks for any information!