The new ethershield (think version 5) needs to be on top because of the ICSP header needs to be connected to the ethershield.If you are using an older shield, there might be an unintended shortcut due to some components on the middle shield,
Thanks... that's probably it. But why does the ethernet shield need to be connected to the ICSP ?
QuoteThanks... that's probably it. But why does the ethernet shield need to be connected to the ICSP ? Check the schematics - http://arduino.cc/en/uploads/Main/arduino-ethernet-shield-05-schematic.pdf - and you see the ICSP header on the right.The names MISO MOSI and SCK indicate the SPI bus, which is used by both Ethernetchip and the SD card.Rob
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