Messages and ichat is not allowing me to video chat or download/upload files.

I have installed and reinstall the latest version of ichat and had downloaded messages beta, but neither will not alllow me to video chat or download/share files. Anytime I initiate the video chat, and the person on the other end accepts, I will either get a message saying that my invite has been declined, or I will receive a communication error message. When the other person on the other end initiates the video chat, the quality is very poor. It cannot be because of internet speed because this also occurs over my schools network. When a person tries to send me a file and I click to download it, it always give the message "Disconnected". My current operating system is Lion with all the software updates, my firewall is off, my internet speed is good, I have mentioned that I have installed the latest version of both (i downloaded messages beta because I thought it would solve my ichat problem, to no avail) and I am able to do these on other programs,(e.g skype and gchat). Help anyone?

Hi,
Exactly what is your Upload and Download Internet speeds ?
"Good" for where you live may not be adequate in the "Real World" scheme of things.
iChat requires at least 128kbps Upload to be able to Video Chat.
This is 128kbps of "free Speed" (Bandwidth) that is not being taken by sharing the connection with other computers or Wifi able devices such as iPads and iPhone (or other phones).
You can add to this that your computer also should not have another app eating into that bandwidth
As Downloads are generally faster than Uploads, I am only really worried about the Upload.
It would also help to know if you are using a Jabber ID (GoogleTalk, Facebook or other Jabber) or an AIM login (AIM, @mac.com or @me.com) and on what platform your Buddy is using.
I ask this as different people report different issues with File Transfers according to account type (and it is not consistent across the different types).
In whichever app you are using currently go to the app Menu > Preferences > Video Section and set the bandwidth Limit to 500kbps
This may help "Smooth out" any issues to do with your ISP varying the speed a lot.
9:52 PM      Thursday; June 21, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
  iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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