Mixer, two possibilities:
1. It doesn't freeze at all. It just takes quite some time to load all mixes. Wait for it to finish, and it should work.
2. A certain mix makes your Mixer crash - if it always hangs at the same position, change that mix's extension to something not "mix", like .Xmix or something. It gets ignored, and with some luck, the Mixer starts.
And yes, I've had both cases...the evil mix in my case was one of TS's, gmenu.mix, I think.
(Is there even such a mix? ARGH! I want my computer back!

)