sys_optimize() bug?

Dear all

When I put this in my dsp routine,

post("dsp on");
post("sys_optimize() = %i", sys_optimize());

I would expect to see this printed when my optimise switch is set to
on in my dsp status window

dsp on
sys_optimize() = 1

and

dsp on
sys_optimize() = 0

when it is set to off.

In fact, it stays to 1 all the time (and the altivec perf is always
called…) Am I doing something wrong?

Here are my specs:
powerbook G4 1.67GHz 1 Gig ram
Mac OS 10.4.8
Max/MSP 4.6.2
XCode 2.4.1 using the latest UB dev tools