White screen on MAC after champ select

Hey,

I know there is already a topic about it but the comments are disabled and the "solutions" are no solutions for my issue:

After the champ select, the display changes for the loading screen but the latter appears as white. Nothing happens until a little pop-up comes out saying there can be a connexion issue. Hitting the "Retry" button doesn't work as the same scenario just repeats. Of course, my connexion is working perfectly fine as I can play other online games, use other apps etc. Reconnecting on the client doesn't solve the issue, launch a complete repair from the parameters doesn't change anything, spam the spacebar during the loading white screen as mentioned in other topics just hurt my fingers... This isn't the first time I experience this problem (the first was a few weeks ago), but the issue disappeared (I don't play much so I just gave up and things worked days later). I had lots of games this week and I even played one before this issue appeared.

I'd like to know if :

1. Anyone has another solution from the ones I mentioned above
2. If Riot has any idea if, for any reason, my connexion is refused or blocked somewhere

I didn't download the PBE as this issue seemed to appear after it's downloading (I'm in EU West btw).

Thanks in advance for all the solutions rioters and players will present here.

Hope to play again soon.