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I had a problem similar to this and it was caused by one query (which I only run once) which was missing the key. Running keyed queries more than 300 times causes an unkeyed query to fail for throttle violation. Fixing the missing key fixed the problem.
@GeorgeEdison: Sorry, the previous question I linked to in this question has a link to a suitable query in it, reproduced here. Search for '"user_id": 2196' in the result to see the pertinent record.
It's not necessary to disguise postings as questions here. Releases of apps and scripts are a special case. See How do I list my app here? and some other postings for information and models.
OK, since Jakub didn't qualify his question I though he meant that code had been added to auto-update the end-users installed copy. Sorry for the confusion.
@George: Chrome (Beta) on Vista. I just tried it on Photography and Game Development. In both cases, a toolbar appeared if I tried to edit a question, but not if I tried to edit an answer.
@Jakub: I don't know why that sounds weird, but some combination of change/toggle and case/capitalization or some variation perhaps. Maybe somebody will come along with a better idea.