Singleplayer is fine but joining any server is blocked, stuck on the screen of Preparing 2/3...

Any help? I could try providing any info if needed.

Thanks

I have a lot of questions, here's a few of them

• What
• How
• Why

Seems cache is the answer. I play incognito and I tried in a normal window, and I was able to join servers. If you have the same problem, refresh cache. 

Thanks everyone for your help