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From @Matioupi on September 28, 2013 21:1
http://forums.adafruit.com/viewtopic.php?f=19&t=44082&p=220114#p220114
It seems there is an issue with micros() function from within ISR handler (when the handler execution time gets above 1 ms ??? )
Copied from original issue: arduino/Arduino#1596