Fellow ChucKists, I believe the code below demonstrates at least one bug that's keeping Mike from enjoying his spaghetti. There are definitely more related issues here but this is one. Appended non-primitive array locations can't be assigned to; clearly these are somehow different from array locations created when the array was created. Not creating a explicit "new" instance and instead appending a different instance directly also leads to reference issues, quite probably these are related. ================================= class Foo { int value; } Foo foo[8]; Foo bar; bar @=> foo[7]; foo << new Foo; <<<"all is fine so far", "">>>; Foo baz; <<<"everybody crash ChucK tonight", "">>>; baz @=> foo[8]; ================================ Yours, Kas.