Are you sure?
I have tested every character myself before I upload them/make videos.
I often spend around 5-10 mins playing as every character and I've never had a problem with them.
Did you add the files to skin.img or replace?
As for your freezing: It means you never rigged the character correctly.
DO NOT export the ped as a SA Body Part and make sure "SA" is ticked, not "VC" or "III"
I tried redoing the entire thing and it worked!
However I haven't tested to rigg asylum-Otto yet.
It has a whole bunch of textures, so will it work?