Problem exporting workouts to Garmin 800

[teleguy57]

Perplexed; trying to export workouts to my 800 as I did a long time ago. Selected an individual workout, sent to device, and using Explorer I see the file in "NewFiles." When I startup the Garmin the file disappears and no new workout shows.

Tried saving to file in "NewFiles" and same thing. Read this post http://www.zonefivesoftware.com/sporttracks/forums/viewtopic.php?f=73&t=15519&sid=5c6e8423952f94eab11bd0ac31c14949#p82016 and played with appending _workout to the file name before .fit and still no go.

What do I try next? Any setting I should be checking?