\WIM\Sources\Options\CoreOptions.lua
Line 303, 304 need changing to
frame.list.scroll:SetScript("OnVerticalScroll", function(self, offset)
_G.FauxScrollFrame_OnVerticalScroll(self, offset, 24, frame.list.scroll.update);
so you can scroll the list of available fonts without lua errors.
Absolutely fantastic job on the new version btw 