Due to an auto-updater failure in one of released client versions, if you are still running that specific old client version you will notice that the country list is almost completely gone.
If you get this view, where there is only the international / globe -icon in the list, re-download the new client version manually from the website.
The old client version will now show as server providers only "Download new client manually from www.EasyAntiCheat.net" -strings to direct you here.

EasyAntiCheat Support forum opened.

10.8.2010
Due to maintenance work behind scenes, the current version of EasyAntiCheat client will not be able to auto-update itself to the newer version released today.
Please re-download the client manually from the download section in order to update the client.
If even after re-downloading the client you are still getting a connection error, then you have not downloaded the new client but actually just an old copy from your web browser's cache.
In this case, please clean your web browser's cache and re-download a fresh copy of the new client.

The CS:Source support has been added back now.

Counter-Strike:Source has updated to newer version, at the same time rendering the current EAC client unworking.
Expect an update on EAC client to fix this within the next 2 days. Thank you for your patience.

EasyAntiCheat client has updated to version 3.5.
As always with new updates, some antivirus software may falsely recognize it as malware.
If your client is crashing or not working otherwise, start Windows without your antivirus loading up.