[spiel2001]

I suspect the GetMacroItem() call is needed in the nUI6 code, too, to make it work with all macros.

EDIT: See if this code block works...

                -- is there a cooldown on the action and what is the name of the action itself?
                
                if buttonDetail.isPetButton then 
                
                    spellName          = GetPetActionInfo( button:GetID() );
                    spellType, spellId = spellName and GetSpellBookItemInfo( spellName, "pet" );
                    caster             = UnitExists( "vehicle" ) and "vehicle" or "pet";
                    
                else
                                    
                    spellType, spellId = GetActionInfo( button.action );
                    caster             = "player";
                    
                    if spellType == "macro" then
                        local item = spellId and GetMacroItem( spellId );
                        spellName  = (item and GetItemSpell( item )) or (spellId and GetMacroSpell( spellId ));
                    else
                        spellName = spellId and GetSpellInfo( spellId );
                    end
                    
                end

                if spellName then
                    start, duration, enable = GetSpellCooldown( spellName );
                end