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.
#5769 - Upgrader applying files that belong to addons which are not installed
An 11 alpha 4 will be quickly released shortly to address this and other bugs.