I've been uploading a lot of testers over the last day, and all of a sudden all my uploads disappeared from 'My Games'.

It lets me upload and play a game, but as soon as I navigate back to 'My Games' I'm told I've not uploaded or created any games yet.

Intermittently they will show up, but more often than not they have, to all intense and purposes, vanished.

If I try uploading the game again with the same ID, I get the usual error message telling me it already exits, so the games are there, they're just not registering on the system for some reason.

Are you sure you're using the same user account? Go to the "My Profile" link and check who you're logged in as.

I only have one account and I don't log out.

In any case, it's happening while I'm logged in.

Next time it happens can you post a screenshot?

Sure.