Yep, it’s broken again - I have reported the new problem.
If you are worried that you might be reaching your minutes limit, you could write a script to fetch build information from the CircleCI API (assuming that is working, heh!). I would hope that would contain run-times per build, and then you could paginate through a month’s worth and add them all up. A bit fiddly, but I imagine this is not a high-priority bug to fix.
Out of interest, what browser/OS are you using? I did wonder if it is a browser-specific problem. I am on Firefox 56 on GNU/Linux Mint 18.