Does anyone know how zero gravity affects the folding of proteins? Or... how does a high magnetic field affect folding?

Well since astronauts survive in space I would assume their proteins are folding OK. The hydrophobic forces/hydrogen bonds/charges remain the same and so the fold is probably the same. Gravity changes what is up and down, not a concern in protein folding.

As for magnetic fields, maybe an issue with metal co-factors, but otherwise wouldn't think much difference