I have read most of the Questions and Troubleshooting Forum, so forgive me if I missed my answer there. My Zbrush 4r6 is fully updated.
When using the extract option in subtools on the masked sections of my mesh it shows the extraction for a few seconds or until I move around in the scene. It then disappears leaving no evidence of it in the subtool pallet or otherwise as far as I know. It does not appear anywhere in the subtool menu and I can’t append it in. Please advise and thank you.