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Before, the interrupt would remain enabled during reception, which would re-set the PCINT flag because of the level changes inside the received byte. Because interrupts are globally disabled, this would not immediately trigger an interrupt, but the flag would be remembered to trigger another PCINT interrupt immediately after the first one is processed. Typically this was not a problem, because the second interrupt would see the stop bit, or an idle line, and decide that the interrupt triggered for someone else. However, at high baud rates, this could cause the next interrupt for the real start bit to be delayed so much that the byte got corrupted. By clearing the interrupt mask bit for just the RX pin (as opposed to the PCINT mask bit for the entire port), any PCINT events on other bits can still set the PCINT flag and be processed as normal. In this case, it's likely that there will be corruption, but that's inevitable when (other) interrupts happen during SoftwareSerial reception.
Arduino
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Arduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP). The boards can be assembled by hand or purchased preassembled; the open-source IDE can be downloaded for free.
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For more information, see the website at: http://www.arduino.cc/ or the forums at: http://arduino.cc/forum/
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To report a bug in the software or to request a simple enhancement go to: http://github.com/arduino/Arduino/issues
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More complex requests and technical discussion should go on the Arduino Developers mailing list: https://groups.google.com/a/arduino.cc/forum/#!forum/developers
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If you're interested in modifying or extending the Arduino software, we strongly suggest discussing your ideas on the Developers mailing list before starting to work on them. That way you can coordinate with the Arduino Team and others, giving your work a higher chance of being integrated into the official release https://groups.google.com/a/arduino.cc/forum/#!forum/developers
Installation
Detailed instructions are in reference/Guide_Windows.html and reference/Guide_MacOSX.html. For Linux, see the Arduino playground: http://www.arduino.cc/playground/Learning/Linux
Credits
Arduino is an open source project, supported by many.
The Arduino team is composed of Massimo Banzi, David Cuartielles, Tom Igoe, Gianluca Martino, Daniela Antonietti, and David A. Mellis.
Arduino uses the GNU avr-gcc toolchain, avrdude, avr-libc, and code from Processing and Wiring.
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