Update for the latest version of Masque.

[StormFX]

In the beta version of Masque, all per-button Masque settings have been moved from the root of the button table to a single table, Button._MSQ_CFG. This is to minimize the bloat in the button table. So line 208 of WeakAuras/SubRegionTypes/Glow.lua will need to be changed from:

        self.__MSQ_Shape = self:GetParent().button.__MSQ_Shape

To something like:

        local button = self:GetParent().button
        local _mcfg = button._MSQ_CFG
        self.__MSQ_Shape = (_mcfg and _mcfg.Shape) or button.__MSQ_Shape

[StormFX]

At the time of creating this, I wasn't 100% sure how this was handled under the hood. I now realize that the line:

        self.__MSQ_Shape = (_mcfg and _mcfg.Shape) or button.__MSQ_Shape

Is due to self being what gets passed to LibCustomGlow. My silly brain thought it was just some internal thing. In any case, the code I gave you was actually incorrect, as it never gets applied. It should be something like:

        local button = self:GetParent().button
        self._MSQ_CFG = button._MSQ_CFG -- Current version of Masque
        self.__MSQ_Shape = button.__MSQ_Shape -- Older versions of Masque

I'm terribly sorry about the bad code. I should have tested it thoroughly. :/