I can no longer open the Music Download page in Musicmatch Jukebox since installing Avast 4.0 Home. Is the program interfering? I use the firewall on my router, not the computer and have never had any trouble before.
I doubt it. The Home version doesn’t even have the Script Blocker module (which could be the only one that could interefer with your web browser, theoretically). You can try to disable avast! temporarily, but I wouldn’t expect it to change anything.