Have a look at the photo I have attached. The file I have opened should be a flat pattern of a sheet metal part (as shown by the preview on the right screen when I first selected the file to open). When the file opens in SW, there is no longer a sheet metal part, but an angle iron. The bend lines still exist but they aren't referencing anything.

Several files are doing the same thing. The strangest thing is that when I delete the drawing, recreate it, and save it all is well; but when I open it up again, it does the exact same thing.

Can anyone shed some light on what is happening? It's too early in the week for errors like this =\