Currently it will just pop up the first time you load the website after a race has finished. So, if you login after a race or if you just finished a race and the website refreshes, it will pop up.
I noticed it a few times, different races in different leagues. When the race was over I would close my viewer browser, but the review windows either wasnt there, or maybe I dismissed it by accidentally hitting something.
GP tabs, 1
Total, between 4 and 8.
On occasion I have iGp open in 2 browsers, Chrome and Mozilla, ready to fire up a new viewer if one hangs for too long. But this is rare, and only when I have some serious free time to myself to live manage a race.
I can try test again this evening to confirm exactly how its acting, but I am not getting into manage live races as much as I would like at the moment :(
I have 4 different races tonight I think, so will do my best to test it out on at least 2.