Thank you Pierangelo. We've been running with that patch since last Friday without problems, so I'm comfortable with the fix. If you can do so without having to spend much time on it, could you give a brief overview of what you believe might be involved in implementing the longer fix? I won't make any promises, but if you give me a hint at what would be involved, I might be able to contribute the code to skip mapping when not needed. That seems like it would be very beneficial.