Please have a look at this simple example patch. It uses an uzi to update 3 texture objects with 1 jit.qt.movie. Expected behaviour is that every plane gets textured with a different movie frame.
Perhaps the texture object stores a matrix reference and the actual matrix is retrieved only at rendertime?
This is on a dual G5, Mac OS 10.4.7, Max 4.5.6, Jitter 1.5.2