@scahoon ,
I wish I had better news, but there is no way for Canvas to automatically fix this. The Canvas servers save the information that was delivered from the browser, but it was the code in the browsers that was sending zeros to the server. In other words, the server never got the correct information to store it. Even if Canvas saved the logs of every request so they could go back and replay them (and I think they might based on a comment I heard at InstructureCon), it won't do any good because the requests all have 0 in them and not the right answers.
You will need to go through and regenerate all of the affected questions.
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