No hacks on them and they still freeze? Are you using Riivolution or Gecko or something else?
Does it freeze when you select a stage with them, when you just select them on the character select screen, or when you just hover your cursor over them?
My Distant Planet would freeze without hacks on it. Putting a hack and module over it fixed that. You might have to do that with them if it's freezing even without hacks on. Does it freeze when you just run Brawl normally without Gecko/Riivolution/etc.?
I could find it out... I think.
Probably it has a little problem with the CSS.
And it was not Ness, not even PT. It was Ike.
The cursor just touches him (without showing anything) and the game freezes.
I'll need to change it a little bit to see what happened.