Screen sharing between server and iMac appears to connect but no window opens

We have been trying to screen share between a server and iMac. Both are running Snow Leopard 10.6.7. It seems like we connect using the share screen app because we don't get any error messages after inputing the username and password but no window opens for the server we are connected to. When I look under the windows tab I can see a checkmark next to our server name and trying 'bring all to front' doesn't do anything. The video card on the server died and was removed by our tech support who said we could still access the computer via screen sharing. Would the server not having a video card be the cause of our problem?
Thanks.

Hi,
A Bit for other reading this thread.
To change the Login port for any AIM based name you have to obviously Log out first and then Change the port (SSL might need to be selected first) and then Press Enter to "Set" the port.
This use of the Enter key is the bit that is different to earlier versions of iChat.
For Gary,
Which Thomson-Alcatel device do you have ?
Thomson-Alcatel Speedtouches used to work well when the firmware that ran them was at Version 4.2.5 or less.
At least at this level you could access the device via Terminal using Telnet and then access the Command Line Interface (CLI) and "Unbind" SIP from port 5060
Later versions of their Firmware did not allow for a full Unbind of SIP and Video and Audio chats could only be partially successful (about 15 buddies out a list of 50
Of course using UPnP to open ports for iChat 4 helps with the Screen Sharing as the process is an Screen Share with an Audio Chat along side and both have to work/connect.
I am surprised to hear that in iChat 5 that Screen Sharing is not working when Video and Audio chats are.
For this reason I would ask how the ports have been opened in the Thomson device ?
After that I would keen to know if the Thomson Device or the Time Capsule is doing DHCP to the LAN ?
(Share an IP on the Time capsule is to Enable DHCP)
I am not sure how AT&T expect anyone to use their site to gain help or see what they currently offer when you have to type in a phone number or area (ZIP code).
I did enter the example number and got to this set of pages http://www.att.com/esupport/main.jsp?cv=801#
I see no reference to any Thomson-Alcatel device.
8:15 PM Monday; February 15, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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