What did XP SP2 break for you?

I like to try the newest things before I try them on any other computer. XPSP2 is a great service from MS but they should have let the smaller companys test it first. It closed ports that we did not know we were using and Symantic has been jumping to get up to date with it. Fire walls like Zone alarm and others are left out and Corel just stops. I have been on the phone with Symantic for hours to get our down loads to work, a work around is to down load each update one at a time. That is a pain for over fifty computers. And we are a vary small shop. What is your problems with the update?