I use a 405CX and the latest version of Garmin Express. When I try to sync from the watch to Express everything seems to be ok: The watch connects, the progress bar is increasing, the watch says "Transfer complete", Garmin express says "Sync complete, see you results online". But when I go to my profile, the new activities are not there...
I've also look into the AppData/Roaming/Garmin/history-folder, but no new tcx-files. Nor any new files in progamData/Garmin/GarminExpress/history or ../pendingUpload. I actuyally seached my c-drive for all tcx-files, but could not find the new activities. (directory names are inaccurate, I'm using a computer without express installed while writing this..)
Any suggestions?