Your comment about where x2 is defined got me thinking. What would matter about the location? Time.
This works:
#include <Flash.h>
FLASH_ARRAY(int, arrayData, 5 , 9);
void setup() {
Serial.begin(9600);
int x1 = arrayData[0];
delay(100);
int x2 = arrayData[1];
Serial.println();
Serial.print(x1);
Serial.print(" , ");
Serial.println(x2);
}
void loop() {
}
I don't understand why the delay is necessary, though.