I accidently clicked HD Geometry on only 600k polys, now the higher res button is greyed out in the geomtry tab... I did press undo right after I clicked HD Geometry, Not sure how to get rid of it.
I had the same problem and about freaked. I'm sure there is a better way, but I just reloaded the tool after I saved it as a different name. The piece happened to be a subtool, not sure if that would make a difference.
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I hope that helps.
If you had UVs you wanted to preserve, use UVMaster to create a clone instead