It has to do with the eu and the us servers not being synced. If you patch from the US server, you have to play on it. If you patch from the EU server, you have to play on that one.
If you patch EU and play US you will have to re-download a new patch. Once that starts you can cancel and go back to EU to play but chances are you'll have to re-download the EU or hopefully just reinstall the .rar or torrent file you downloaded.
"If you patch from the US server, you have to play on it. If you patch from the EU server, you have to play on that one."
exactly, we have one server, he has some placeholder stuff going on here somehow with a future idea of another server, and yet its not cleanly setup for the ONE server we all play on. If that was not the case then the patch server wherever you grab the patch from would not matter, as the file/version checking for your clients should all be identicle, its obviously not somewhere.