I'm working X-Platform between a G-4 Mac and a Pentium III Windows XP machine. When I create a workgroup reference on my PC and then I load the file on my Mac, the reference disappears. The layers remain as if they were still referenced but the reference itself is gone. It's almost no problem to go back and recreate that reference except it's a little time consuming due to file size. The files are on a Mac file server and the references do not move locations. Thanks.