[Kharthus]

In my case I was actually trying to pass a value to another function, but it looks like FauxScrollFrame doesn't like that. I changed the code to this and it's working correctly again.

<ScrollFrame name="LivestockCritterMenuScrollFrameTemplate" inherits="FauxScrollFrameTemplate" virtual="true">
        <Anchors>
            <Anchor point="TOPLEFT">
                <Offset>
                    <AbsDimension x="0" y="-8"/>
                </Offset>
            </Anchor>
            <Anchor point="BOTTOMRIGHT">
                <Offset>
                    <AbsDimension x="-30" y="8"/>
                </Offset>
            </Anchor>
        </Anchors>
        <Scripts>
            <OnVerticalScroll>
                FauxScrollFrame_OnVerticalScroll(self, offset, 15, Livestock.CritterMenuUpdate)
            </OnVerticalScroll>
        </Scripts>
    </ScrollFrame>

function Livestock.CritterMenuUpdate()
    Livestock.BuildMenu("CRITTER")
end