[Fizzlemizz]

In my rune code I check that start has been given a value (Blizzard does also in their UpdateRunes function which probably means GetRuneCooldown can return nil for start no matter what the online docs say) so a change to something like:

local function CalcRuneCooldown(self)
    local cooldown
    local start, duration, runeReady = GetRuneCooldown(self)
    if start then
        local time = floor(GetTime() - start)
        cooldown = ceil(duration - time)
    end     
    if (runeReady or UnitIsDeadOrGhost("player")) then
        return "#"
    elseif (not UnitIsDeadOrGhost("player") and cooldown) then
        return cooldown
    end