BJ Gearbox

2 MacBook Pros and an iMac all have same problem after moving to uverse. I can get in but once I try to teleport it takes an excessive amount of time and logs me out with only an option to quit or chat. Previously had DSL with AT&T with no trouble. Using SL viewer because of streaming media. The Macs are less than a year old. I was going to try changing open ports but the listing on SL site looked old enough to be fro an earlier version of SL Viewer. Funny the MacBook Pros work fine if I go to my nearest AT&T hotspot @ Starbucks... and my Dell i7 desktop works fine with the Uverse at home. Are there any other things to check besides ports on the firewall in the modem? I've spent hours with AT&T support. Over 6 hours in one evening alone (at least 7 different "helper" and no one has any understanding of SL, modems, or firewalls).