GE 3.1.5.0, OS X 10.9.2 and 910 XT v3.0
This has been an ongoing issue with GE that has still to be resolved, If 'Erase data on this device after successfully syncing' is checked problems occur. This time, the activity was apparently successfully synced, but it did not appear in Garmin Connect. The file was not in the computer, but it had gone from the device. Previously, the file was saved but was corrupted and obviously failed to upload
One correct action out of 3 isn't too bad I suppose. :confused::mad: