William, Are there any reasons you haven't tried avr-gcc 4.6.2? It was said previously that there are many avr bug fixes in the gcc 4.6 version, and it's also the current gcc version with better optimisations than 4.3 (I haven't put much/any effort into 4.5). The gcc version used by Arduino is still 4.3.3, so if you upgrade, what's the reason for not upgrading properly?
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