Edge 500 saves it FIT format doesn't it? How are you getting TCX files off a 500? TCX file uploads are a known issue, the file size of TCX is huge compared to other files and there is a problem with those currently. Three options...

1.Use FIT files, Edge 500 defaults to this
2. Use Device Agent to upload
3. Upload to Garmin and use AutoSync

PS it's not a problem with run files because runs are usually shorter and I'm assuming you have a power meter, cadence sensor which adds tons of data :)

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Rodney
TrainingPeaks | Altra Running | RAD Roller
http://www.goinglong.ca