[Phanx]

InterruptBar does not give its frame a global name, so you cannot (easily) access it from outside of the addon's own Lua file. The following simple modification to InterruptBar.lua should work.

Find this line, near the end of the file:

	["COMBAT_LOG_EVENT_UNFILTERED"] = function(self,...) InterruptBar_COMBAT_LOG_EVENT_UNFILTERED(...) end,

After it, add:

	["ZONE_CHANGED_NEW_AREA"] = function(self)
		local _, instanceType = IsInInstance()
		if instanceType == "arena" or instanceType == "pvp" or (instanceType == "none" and GetZonePVPInfo() == "combat") then
			self:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
			self:Show()
		else
			self:UnregisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
			InterruptBar_ResetAllTimers()
			self:Hide()
		end
	end,