Sorry, I made that post too quickly and meant to edit it later, but I simply forgot :D
Anyway, as you said, Windows 7 is a beta OS.
EB does not officially support Windows 7, and my guess is that your problem is still somehow related to that.
I've heard from several people that they have issues with some (but not all) PB-enabled games, when running Windows 7.
It's definitely strange that it only happens in servers that are overseas though, so at this point all you can do is wait for EB's response, pretty much.
Edit: Your sure it happens on all overseas servers? It could be that it only happens on servers running pv_sv_restrictions 1 (or 2), and that the ones it works on, simply have it at 0 (or 1).
Edit2: What did Evenbalance reply to your ticket?