Just spent two hours two minutes with Garmin's Advance Support desk. Basically it appears that there was a firmware upgrade that resulted in my 705's ability to download new activities to Garmin Connect. After being on hold twice for 30+ minutes each - the answer was to turn over control of my desktop to the advanced customer service agent. He then replaced the current version of the newest software with an older version. Now I'm able to download new activities.
THE PROBLEM IS that this resulted in deleting ALL activities from my 705 - including several invaluable rides/races over the course of the past two and a half weeks. No warning on this - all gone. Now I also have to go back and reset all fields, tones, etc on the device.