I found something, I have same issue in Zbrush 2020.1, and also with Custom UI and Delete button, but you can find Special Delete button in Macro menu with description (Use this button for custon UI) :)
Zbrush 4R4 P2 - anyone experienced this kind of thing? I have my own custom menu, that now seems to only be displaying half of the buttons I've added. It was previously working fine. Restarted Zbrush - missing again, loaded tool - all custom buttons show up - 5min later disappears again. Anyone? Driving me fucking NUTS.
It work for me just create a hotkey to delete a subtool and for the sake of god I don't use the delete button, cause otherwise my custons disappear immediately
For me it always happens when I delete a Sub-Tool. I don't know why it happens but the only solution I've found is to save the UI regularly if i make changes (to a file of course) and use the Store Config button in Preferences. When it's been stored you can easily reset the UI as Pabs said. Just posting incase someone else…
The issue still persists in Zbrush 2019, and yes i do have a file from which I can restore config but it's rather annoying to do it every time i delete a subtool. Did anyone found the solution to this bug yet? UPD: Noticed a strange thing, it only messes up the custom UI if you press "Delete" button if it's not in the…