Make the mask modifier use faces
At the moment, the mask modifier only understands vertices. This means that theres no way to do something like have all but one face visible, since if your vertex group is all but one faces, technically speaking the vertices of the unselected face ARE selected, and so the face remains visible. If you set the vertex group to use only one face and then invert the modifier, then several faces are made invisible (as shown in the picture attached) even if that wasn't your intention.
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* @Jason van Gumster * Hadn't seen that, that's very cool! Thanks for sharing!
for me this is more a problem of selection. I noticed that if you select all faces except 1 and do Ctrl I to invert selection. nothing is selected. same thing if you switch from faces to edges selection, selection is lost. not logical...