Just about to join in with this and on the site it says:
Due to what appears to be a database 'glitch', the website has experienced a certain amount of data corruption and/or loss which is currently being investigated.
The nature of the problem suggests that there may be problems reconciling players with their original teams, but only those that have created their teams in the last 4 or 5 days.
If your team no longer appears under the 'Manage my Team(s) menu - the easiest solution would be to simply re-create a new team. Work will continue to establish the cause of the problem, and I can only apologise for any inconvenience caused.
... so in case you hadn't seen it and had chosen a team recently, you might want to check.