I am using an NANO, and the program will compile with SSD1306 but the program won't run. uses (19258 of 30720 bytes). Global is (1000 of 2048 bytes).
If I put a Serial.println("TEST"); just under Serial.begin the monitor will display the TEST message then I get four backwards question marks a couple small capital "I's" then four more backward question marks with a small box beside them. And the program doesn't run?? Hope this helps.
Thanks for the input.