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Just a heads up to anyone else using Communicator with V19. I've been having intermittent problems with the importation of 3D models since I got our IT group to install the upgrade, a couple weeks ago. The error message is "remove mechanical structure before importing". I was led to believe there was something wrong with the IGES and STEP files I was importing. Yesterday however, I finally realized the problem doesn't affect the first model I import, just subsequent models. Apparently Communicator or BricsCAD V19 flags every import as a "mechanical component", gives it a name, and then assigns a "product structure" to the drawing. If you're not creating an assembly and don't have the mechanical browser window open, you wouldn't know this. The next time you try and import a 3D model, the program tries to bring it in with the same name. This creates a conflict, and results in the error message.
The solution, according to the support group, is to go into Settings, and set Communicator Import Product Structure to "0". I wish Bricsys would let us know when they make a change like this.