With the help of pkourany port of the Adafruit SSD1306 and GFX libraries, I have a 128x64 OLED working with the spark core.
The problem is that if I add the single line
the spark core apparently loses the ability to connect to WiFi and I get a series of flashing blue, green and then red LED lights and then the pattern repeats. Similarly if I add the SSD1306 and GFX code to a working TCPClient program, the same thing happens.
Would anyone have any idea of what the apparent incompatibility is between the SSD1306/GFX libraries and the spark core TCPClient firmware?