I've had a very frustrating day. Started with the latest version of the Low Latency Data Logger, now called "ExFatLogger". I want to eventually get the Adafruit LSM6DS33 + LIS3MDL - 9 DoF IMU integrated into the logger. This process was progressing well until I started to get random compile errors. I eventually gave up on the modified source and started again with the original code.
I eventually tracked down the problem. The IDE (Web) would revert back to using an old Adafruit version of the SdFat library instead of the V2.x required by the latest version of ExFatLogger.
I did have two copies of the editor running. One did have the AdaFruit code for the LSM6DS33 which I was copy/paste into the ExFatLogger.
Any way to insure I don't run into this type of problem in the future?