Collaboration - Instant Messaging

Hi,

I face an issue while trying to use Instant messaging with EP SP 11 Sneak Preview Edition. I have setup CLP and RTC Options in Default Framework page and when I tried to click on a contact from CLP and select option for "Send Instant Message" a window opens in minimized mode and hangs indefinitely there after.

I've tried restarting the server and I've also ensured that I'm sending the message to a user who is in online mode only.

Please help.

Regards,

Chaitanya