Following on from #83 When a macro executes it is a black box. You cannot tell if a button works or fails.

Add the following debug to SEQUENCEDEBUG as an option for sequence execution.
Button, Spell, Success
Button, Spell, Fail, Cooldown
Button, Spell, Fail, GCD Cooldown
Button, Spell, Fail, Resource Unavailable

GetSpellCooldown = http://wowprogramming.com/docs/api/GetSpellCooldown
GCD Check - http://www.wowinterface.com/forums/showthread.php?t=52816
GCD Tracker - http://wowprogramming.com/snippets/Cooldown_Tracker_12
Is Usable - http://wowprogramming.com/docs/api/IsUsableSpell

My changing the onClick on https://github.com/TimothyLuke/GnomeSequenced-Enhanced/blob/master/GS-Core/Core.lua#L84

to
local OnClick = [=[
local step = self:GetAttribute('step')
print("step =" .. step)
self:SetAttribute('macrotext', self:GetAttribute('PreMacro') .. macros[step] .. self:GetAttribute('PostMacro'))
print(macros[step])
...
]=]

I can print the macro execution.