E-Mail script gone bad

[Stevehas]

Whenever I trigger a script to send an e-mail with data from a current record I get the following return,

my e-mail client (Lotus 6.5) opens

a new message is created

the subject line gets populated from FMP as instructed

a message is placed into the body of the e-mail by FMP as instructed

but

the e-mail address is not populated as instructed by FMP

and then FileMaker 8.5 (via Server Advance 8.0) delivers a windows error message and shuts down.

I have run this script for a couple of years on FMP 7.0-7.5 via server with the same e-mail client.

I don't understand why this is happening now. Is it a problem with the e-mail, or FMP client?

Is it a network issue, (this is running inside a small company via a virtual server)?

Help!