I working on the Joan of Arc tutorial (Maya version), but now when I try moving the vertices on the poly model, both smoothed proxy's disappear. (The original and the duplicated)

Re-opening the file gets them back, but as soon as I move a vertice, they disappear again.

Any ideas?

Try deleting the history and if that doesn't work delete the proxy and make a new one. And remember to save copies of your work so that you have something to fall back on.

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"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man."

George Bernard Shaw - Man and Superman