I am a networking consultant working with a large architectural firm. They have run into an AutoCAD problem that I have never heard of before and don't have the foggiest idea where to begin. I haven't worked with CAD -especially AutoCAD- in years so I thought I'd post a summary and see if anyone has heard of this one. Although I've never heard of a virus affecting CAD files, this phenomenon sounds almost viral in nature. The problem seems to be spreading around the office. First it was one person, then their project team now loads of people. The first symptom, which appeared a few days ago, was that the XREF dialog box would not appear. When "XREF" is entered at the command line, the resulting prompt is "Specify block to insert." The second problem that appeared today is that the affected users can not explode any blocks at all. No error is reported, the block just remains the same. Some users are still fine but once affected (infected?), they stay that way. Any and all help would be appreciated. -Bruce
