I’m still not sure I follow what you are trying to say…500k isnt a huge amount on a 4mb cable connection and shouldnt cause these issues…

I did get a form letter response back from Yahoo, and while their tips didnt fix the problem, its good configuration information to have for others who may be having similar issues with v7:

You may be experiencing an issue because you are connecting through a
firewall and/or proxy server. In order to solve the issue, you will
need to configure your firewall and/or proxy server. The following
information should assist with your configuration:

Basic Connection:
Protocol: TCP or HTTP
Servers:
– scs.msg.yahoo.com
– scsa.msg.yahoo.com
– scsb.msg.yahoo.com
– scsc.msg.yahoo.com
Port: 20,23,25,80,119,5050,8001,8002

Webcam Connection:
Protocol: TCP
Server: webcam.yahoo.com
Port: 5100

File Transfer Connection:
Protocol: HTTP
Server: filetransfer.msg.yahoo.com
Port: 80

File Sharing Connection:
Protocol: HTTP
Port: 80

Voice Chat Connection:
Protocol: UDP or TCP
Servers:
– v1.vc.scd.yahoo.com
– v2.vc.scd.yahoo.com
– v3.vc.scd.yahoo.com
– v4.vc.scd.yahoo.com
– v5.vc.scd.yahoo.com
– v6.vc.scd.yahoo.com
– v7.vc.scd.yahoo.com
– v8.vc.scd.yahoo.com
– v9.vc.scd.yahoo.com
– v10.vc.scd.yahoo.com
– v11.vc.scd.yahoo.com
– v13.vc.sc5.yahoo.com
– vc1.vip.scd.yahoo.com
Ports: 5000-5010