Thank you Krodal for your sketch. I tried your sketch without resistors and then with resistors, at address 0x68 and 0x69, and the result was the same:
InvenSense MPU-6050
June 2012
WHO_AM_I : 3, error = 2
PWR_MGMT_2 : 3, error = 2
MPU-6050
Read accel, temp and gyro, error = 2
accel x,y,z: -31117, 283, 2288
temperature: 38.035 degrees Celsius
gyro x,y,z : -3838, -16640, -29695,
MPU-6050
Read accel, temp and gyro, error = 2
accel x,y,z: 29574, 6913, -4088
temperature: 42.535 degrees Celsius
gyro x,y,z : 753, 191, 396,
MPU-6050
Read accel, temp and gyro, error = 2
accel x,y,z: -31117, 283, 2288
temperature: 38.035 degrees Celsius
gyro x,y,z : -3838, -16640, -29695,
MPU-6050
Read accel, temp and gyro, error = 2
accel x,y,z: 29574, 6913, -4088
temperature: 42.535 degrees Celsius
gyro x,y,z : 753, 191, 396,