Changes tracker broken (again)

The changes tracker is broken again showing no changes (after taking a very long time trying to load). Problem happens from time to time I think so drawing it to admin’s attention here.

Here it’s just switched to Error 500, which at least is a quick fail.

ok, thanks will look into it.

Assuming it’s not coincidence, I’ve suppressed the problems here by nuking Firefox’s cache.

Seems to be behaving again. Perhaps someone tightened the elastic bands on the server.