Worked yesterday, won't come up today; comcast problem?

Question

I hope someone can help. My internet provider (insight) has just been bought by COMCAST. The switchover was a couple of weeks ago. I hadn't experienced any problems iChatting until this morning.
This morning I woke up to find no internet connection; just getting a "Welcome to Comcast" screen. After numerous calls to different comcast techies, where they "removed the 'codes' on my account that came with my insight account" (I think these were static IP addresses, actually), little by little, I was able to see different parts of the internet.
The last fix made my gmail inbox visible; before that, it had been "blocked," they told me.
Now everything is fixed except my iChat - I pull up the application and after a while it times out;
"The connection could not be completed because it timed out. Try again."
I have set the bandwidth to 200kbps, and reset and tried again, but I don't think we even reach this; my buddy list just says "disconnected." Tried on my husband's computer; same thing.
I have been ichatting with mom and sister who both use comcast in the Chicago area for at least a year; until this morning.
Now comcast tells me different stories; 1) Comcast is not compatible with iChat (obviously not true), 2) I need to reconfigure my iChat (?), 3) I need to call Apple for help.
I hope someone can help. I use iChat all the time. Until today.

Answer 1

well, looks like it's working again. Comcast insisted that I tell Apple because it's "obviously their problem" so I asked, "can you tell me what to tell them when I say, 'My computer works on internets everywhere except on Comcast' and 'it worked until this morning when I got the "welcome to Comcast" screen'?" and they said, "It is obviously apple's problem.
A couple of hours later the problem was gone. I just wish someone would tell me what went wrong (or apologize). At least I can ichat now, and I didn't have to change anything!