"Jake
I set up my second driver from loading the first drivers stats.
I then did 3 runs (at which point it was a perfect set-up) but the test button and save button stayed grey.
Thankfully I took a screenshot of my set-up before I closed it but when I returned it had not saved anything from the point of loading.
I set up with the stats on the screen shot and then saved - this worked ok.
This happened to me yesterday, but when i changed page it asked me to login again, so try CTRL+F5, or log-out and back in again and it should save