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I have applied twice and never heard anything back on either ocasion.
You should receive an automated e-mail that you have to reply to when you apply. If you don't receive the automated e-mail then the ODP hasn't received your application. If you apply and get rejected then you also receive an e-mail with general or specific guidance as to why you were rejected and whether you should consider reapplying.
Someone with a better knowledge of the technical details of the submission process might be able to suggest why your application might not have got through.
As pointed out above, due to technical upgrades currently ongoing, you should wait for a few weeks before considering applying again as we can't process applications at the moment.