GetAddOnMemoryUsage... confused

[Kayja]

Busy just writting up a little addon as replacement to SLDT which I just use to purely show a small strip on my MiniMap like: "x fps x ms x.x mb", so I shoved this little addon together below but for some crazy reason it just won't collect the data from GetAddOnMessageUsage and constantly returns 0 (not nil, just 0 as a number) and it has my head pickled as I can't figure out why... any ideas?

f is the frame, f.txt is the font string. fps and ms work just fine, mem however doesn't.

local new, mb = 0, 0

f:SetScript("OnUpdate", function(self, old)
	new = new + old
	if ( new >= 3 ) then
		for i = 1, GetNumAddOns() do
			if ( IsAddOnLoaded(i) ) then
				mb = mb + (GetAddOnMemoryUsage(i)/1024)
			end
                end
		
		fps = format("%.0f |cffff0000fps|r", GetFramerate())
		lat = format("%s |cffff0000ms|r", select(3, GetNetStats()))
		mem = format("%.1f |cffff0000mb|r", mb)
		f.txt:SetFormattedText("%s %s %s", fps, lat, mem)

		f:SetWidth(f.txt:GetStringWidth())
		f:SetHeight(f.txt:GetStringHeight())
		
		new, mb = 0, 0
	end
end)

[Kayja]

Nevermind all sorted, forgot to call UpdateAddOnMemoryUsage().