I need to use Screen Sharing (in iChat) for my job, but I'm unable to connect. Every time I try to do so, it tells me that it has failed. I'm relatively new to Macs and therefore am not sure what steps I should take. The person I'm trying to share my screen with (or see their screen) is able to share their screen with everyone except me. Any ideas? What settings should I be checking? I dug through a bunch of old threads but with little luck. Thank you!