Can't Erase Any Part of Weight Maps

Title should be self explanatory - I'm rigging a model for the first time, but weight mapping is nigh-impossible because I can't erase. From what I understand, you're supposed to hold down Alt and use the brush to make it an eraser... but when I do that, it still only works like a normal brush, adding instead of subtracting. The maps aren't unresponsive since I can still add. However, there's no blue coloration anywhere either - just gray. Is this just some random, specific bug, or am I doing something wrong?

Comments

  • The grey is vertices that aren't weighted - in order to reduce memory DS switched to leaving unused vertices blank isntead of making them explicitly zero. As for the erasing, check the modifier assignment in Window>Workspace>Customise at the bottom of the dialogue.

  • I'm not seeing any "Customise" or "Customize" option/button/menu in the Window>Workspace menu. There are two items labeled "Workspace" under "Window," but their sub-options are just "Select Layout," "Save Layout As," and "Delete Layouts" or "Off Screen Pane (Tab) Groups," "Enable Activity Bar," and "Orient Tabs Along Top," respectively. 

  • If you haven't reloaded your layout or updated the menus recently you should - but you should also check the Edit menu for the Customise command.

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