Same issue, if I try to add a new entry either via add task or via the quick add feature on my iPhone 4S iOs 6.1.3 (latest at the time of writing) it just doesn't add it, silently, no error. I recently ran out of space on my iPhone, have freed up 19gb but having restarted the device, that doesn't seem to have solved the problem.
Additionally: when I logged into the toodledo site, I found that most of the things I had added on my iphone were no longer synced with the website. So I hit the force sync (iPhone to site) which made the entries appear on the site and then made all te entries on my iPhone look as if try had been "added today". Thought I'd mention this in case is some weird sync issue. (Add item on phone, sync to site, site doesn't have it, delete from phone or similar).
It also did not sync down to my iDevice. I added someting on the web version andd it did not come to my iPad.
I deleted the app from my iPad, then reloaded ot from the appStore. That seems to have fixed it per Jame's note above. Be aware though that you will lose your settings if you do that. I will wait for the upgrade on my iPhone which apparently has been submitted.
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