Processing 0097
Windows XP SP 2
Java 1.5.0_06

There are two calls to setup() when setup() calls size(width, height,
MODE), and MODE is P2D, P3D or OPENGL. Sample sketch:

void setup() {
println("setup");
size(400, 400, P2D);
}

outputs

setup
setup

that's by design. if the renderer is changing an exception is thrown so
that setup() doesn't complete because the renderer must be valid before
setup() can be run.

that's also one reason why size() must go first inside setup().