FileMaker Crashes when connecting to a PC Server

[dvalley]

A coworker has this problem. FM Dev 6x on a Dell Laptop (win 2000). FM Server 5.5 on mixed platform OSX and Win2000 Server. She can connect to the files served on the Macs, but if she connects to a PC server first, she crashes. (if she connects to the Mac first, she can connect to the PC later with no problem).

When she first connects to the FM network, her Zone alarm shows that Filemaker attempts to access the internet at 255.255.255.255 port 5000. This is not an address on our network (or subnet mask). The crash error is:

FileMaker Pro-[invoice Viewer.fp5] FileMaker Developer.exe - Application Error

The instruction at "0x77805a10" referenced memory at "0x001e7000". The memory could not be written.

Click on OK to treminate the program

She has removed and reloaded the application already. Any ideas?