Solved

Race viewer loading bug

Yesterday race viewer loading was the whole race long, so I wasn't able to play. It was super slow, even though I tried to restart it several times, which had helped in the past, but yesterday it was useless. The last attempt was like 10 minutes resulted in 90% of the loading bar, but the race was about to be over at that time. 

Can you try to spectate a race that was at the same track as you had last night? 

If I am understanding you correctly you were not able to completely load the viewer to join a race? So you never got the igp spinner or connecting screen.

If you still have issues are you able to open your developer tools for your browser, google.com is usually your friend for finding out how to do that if you do not already know.
Open the console and send us a screen shot of it if there is a lot of errors. What i'm expecting happened is it tried to load in a resource and it failed to retrieve it causing an error but the screen looked like it was still loading.

I'm not able to spectate races because what it shows me is "no races found at this time". 

I got the igp spinner and then the game resourced loading bar, but it was loading at the speed like 1% per 10-20 seconds. So I was at 90% after like 10 minutes or so. 

Unfortunately I can't open the developer tools as I'm far away from home and I have nothing but my phone atm. I'm using the app and those problems I've mentioned are presented in the app. I haven't tried using the browser version for a long time. 

UPD: so I caught some races in the spectation menu, found the Brazilian gp during which I wasn't able to join yesterday and it worked fine. Loaded the race in several seconds as usual and everything was good.