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Zbrush won't load zpr file correctly or any of the incremental quick saves

Hi,
I tried to load the zpr file I was working on this morning and instead of loading my work I just get a polymesh3d star. On load, it says is has retrieved 5405 undo steps, it appears I accidentally saved undo history on this mesh. However, once the mesh is loaded there are only the first two history steps which are useless to me. I also attempted to load an older version from my quicksave history and they are showing the same issues.

Quicksave history:

Oldest increment in my history:

My primary zpr file is large, should have something in it:

Loading my primary ZPR says it was successful:

My quicksave file sizes:

Have you tried to load it without the undo history?

Yes, turn on Preferences>Undo History>Skip Loading and then try loading a file.