Can you please provide the ip address and port of the server so that alfred can look into this issue.

It's in client, not in server.

indeed, but in order for alfred to look into this issue, he needs to be able to reproduce the issue.

Try to say /top15 in any server, there will be just black screen.

Yeah same issue here, motd is not showing as intended after you are connected.

Any changes for the MOTD has been done?

Unchecked with the new update

EDIT: MOTD has been changed according to the notes. Updating ^^

Fixed MOTD context menu to have localization strings for available options and for make back/forward work

EDIT2: Nevermind it seems to work now.

I just give an example of /top15. There is also no motd then i connect to server or in newgame. Just black screen, but no window. Or sometimes there is motd, but it not refresh.

You can check it on nihil.hu:27015 (no motd, say /top15, etc.).
Server is updated (version : 48/1.1.2.7/Stdio 5964 secure (10)), i placed back the default motd.txt
CS client reinstalled, and i try the beta client (steam and CS) with no luck.

It's client problem, not server.

Yes. This is because of client. My server's plugin worked well till the problem appears, but after I logged on into my server - https://github.com/ValveSoftware/steam-for-linux/issues/2062

No motd windows too... It's just black screen like there https://github.com/ValveSoftware/steam-for-linux/issues/2197 ... I have the same problem

version : 48/1.1.2.7/Stdio 6153 secure (10)

Now it is OK!