Agree 100% with Markus! The Big Boeing FMC User Guide is an absolute must! Use it for the PIC 767 and the PS1/PS1.3 747-400 from
www.aerowinx.com and it always amazes me how good these two sims are!
Markus,
Thanks for pointing out the differences between the Honeywell FMC's and the Airbus MCDU, didn't know about the more accurate FMC database, very interesting!
Felix,
Sorry for misunderstanding you, I actually have the PSS A3XX, but never came across the waypoint, waypoint overfly issue

Don't fly it very often.
Hope somebody will soon release a better Airbus, well, the PIC A320, the Anticyclone A340 and the SSW A310 look all very promising
Back to your pitot heat question.
The yellow message "PROBE HEAT" only appears in the upper EICAS, real and PIC, if pitot heat is out of order or engines are off. Reduces pilot workload!
You can simulate a pitot heat failure with PIC 767 and watch how the yellow "PROBE HEAT" message appears in the upper EICAS.
Sam