I installed IDL6.1 on OSX 10.3 (Panther) and on OSX 10.3 Server, and everything worked fine. Then I did an upgrade to 10.4 (Tiger) on my PowerBook G4 - again, this worked fine. However, when I upgraded to OSX 10.4 Server on my desktop G5 and G5 server, I get a segmentation violation as soon as I try to fire up idl or idlde.I suspect that there is a library conflict somewhere, but it seems strange to me that it works on 10.4 but not on the server version of 10.4. Any suggestions? I'm going to try to do a new install on the desktop and server and see if that solves the problem.