Not able to send e-mails from lotus notes webmail in Vista

Using IE7 & lotus notes server I am trying to reply/forward my e-mails in vista, it's NOT working, the cursor hangs & a red cross ("X") appears & doesn't allow me to do anything, can anyone help me on this urgently please. Thanks in advance.
You could respond to my e-mail address as well: [email protected]

The use of Notes implies a relatively large enterprise with IT infrastructure staff and maybe a helpdesk. I would suggest talking to them because such a specific problem in the webmail interface of their Notes server may be something they're already aware of, which could mean a quick fix for you.

Otherwise, if you've been left to your own devices to troubleshoot this issue, I'd suggest checking whether you've got similar issues when you try to use the Notes web interface from different machines - perhaps even a completely different machine in another environment. If you encounter the same symptom irrespective of what/where you're accessing the system from, it will have to go back to the server admins for troubleshooting from their end.