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There might be a problem with onplayerconnect or onplayerclassrequest or maybe onplayerspawn callbacks, but anyway try using crashdetect plugin. Then wait for someone to join your server.

EDIT: Make sure there is no error or warning after you compile your fs or gm.

EDIT2: Try to use CRASHDETECT plugin.

EDIT3: Does it save the player account after he register? Any register log?