Send Mail script problems

Hi,

I was wondering if anyone has a suggestion to the following problem:

I created a Send Mail script in the server (FM 5.0 on MAC OS X) application which is triggered by a change in the field. It worked perfectly on mine and other user's client computers (PC's).

I received a new computer, and, after installing FileMaker 5.5 on it, the Send Mail script will hang, and I have to abort the application (CTL+ALT+DELETE). I tried to select in Control Panel/Internet Options/Programs different programs as my default e-mail - Netscape, Outlook, etc - nothing worked. Then I installed Pegasus Mail MAPI extension, and it works now - it uses Pegasus as an e-mail program. However, if I try to change my default e-mail to anything else, it still uses Pegasus.

Another user had to re-install FileMaker 5.5 on her computer, and, although the e-mail script was working on her computer before and she was using Outlook as the default e-mail, it does not work now and hangs her computer. I tried to install Pegasus MAPI extension on her computer as well, but it did not resolve the problem. She still cannot use Send Mail script.

All other users are OK, they do not have Pegasus MAPI extension installed, and the script works fine for them, and they can select any e-mail program as default.

I did not make any changes to the Send Mail script on the server.

Any sugestions? I would really appreciate your help.