And yes, I've already cloned my tool... still no dice. I also messed with the memory limit and adjusted it so I could have more divisions. Other than that, I haven't touched a thing. I don't understand why a simple clone won't get rid of the geo. That's what I've read to do in this case. Any ideas?
EDIT: Meh, wasn't that far into it. Just started over. I read in the help that you can't undo it, but I don't know. I've seen some places online that said the clone thing worked.
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If the HD was a mistake and you can't Ctrl+Z out of it, or if you figure you just dont need that many polygons afterall, the solution is to turn off the HD preview if it is currently on, hit the Make Polymesh3D button (which is like creating a clone of the mesh, but only in its current state with all other data gone). You can then subdivide the PM3D version normally, or Reconstruct Subdiv levels to try and recreate any lost lower levels.