"Basic with Callbacks" example. Works fine for Nano, but fails on the Arduino Mega 2560 - it can't compile the sketch Build options changed, rebuilding all In file included from /Users/redacted/Lib ...

I just did an up date to Arduino and got this message. I have used this computer and this arduino a few times before without this issue. Arduino: 1.6.8 (Mac OS X), Board: "Arduino/Genuino Mega or Mega ...

ElectroCookie Uno Terminal Block Shield Kit, Compatible for Arduino Uno R3, Push-in Simple Spring Connector Expansion PCB Module ElectroCookie Proto Shield Kit Compatible with Arduino Uno R3 ...