This happened to me on my 3rd team. I logged in quickly before a match and most of it froze. I think its because of all the messages generated at the start of the new season - the last 2 messages were unreadable and clicking most of the icons produces Nada. The red 'alerts' blob on Messages had no number on it.

I didn't really have time to explore it but when I logged back in later it cleared and there were fewer messages - althugh I lost because of so many retirals etc (which was my fault).