We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
#2618 - Editing dob issue
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Upgraded Bitnami Wampstack, so hopefully no more issue. I suspect it was a dodgy install, seems fine on the new stack and latest pull. Not even getting logged out :)
As to how it corrupted I couldn't say, but it's not possible for a Composr bug to cause it.