Placing arrays into an array

Using Arduino Programming Questions
8 
int intLengtharrRedGreenBlue = sizeof(arrRedGreenBlue) / sizeof(arrRedGreenBlue[0]);

That value is NOT the length of the array. It is the number of elements in the array.

memcpy( arrCurrentColorset, arrRedGreenBlue, intLengtharrRedGreenBlue );

That function wants the number of bytes to copy (the size of the array), NOT the number of elements in the array.