I haven't looked at your DXF file, but can almost guarantee (based on your description of your problem) that what you are experiencing is due to lines, arc, etc. (Entities) which are not connected. You should use snap features in creating your drawing, to ensure that intersecting lines and arcs are actually connected. You might also try experimenting with LazyCAM's Extent settings, and then use the AutoClean function, followed by the Pocket creation. Hope this helps. I know how frustrating it can be (especially with a slow graphics card).