Instead of ZONE_CHANGED, use PLAYER_ENTERING_WORLD. This will fire both when you first enter the world (no matter what kind of zone you're in) and whenever you pass through a loading screen.
Also (I might have mentioned this in one of your other threads) semicolons at the end of lines are not needed in Lua. They can
technically avoid issues with ambiguous syntax, but I've been writing WoW addons in Lua for about 7 years now and have never even seen any code where a semicolon was needed to clarify the syntax, so unless you're dead-set on using them as a carry-over from some other programming language you're used to working with, I'd suggest leaving them out to reduce clutter in your code.
