Messages bug on Macbook pro mid 2012

OS: Yosemite 10.10.5 (14F1021)

Messages: Version 8.0 (4760)

Today my Messages started to look like this:

Yesterday it was working. iMessages still work fine on my iPhone.

When I saw the issue, I tried to sign out from all my iMessage accounts on macbook and then sign in again. It went smooth (I was asked to enter pincode from Macbook screen on my iPhone to authorize Sign In), but it did not fix the issue.

Anyone experienced same problem?