Indeed. US server is not updated yet, so when you access it with patched client, it sees a version it does not know how to handle yet. Just wait till server is up with the current patch, then the patched client should go right in.
-- Rustyx --- 92R / 92S / 92M on Reni (Guild KnightShift). Yes, running the new FOTM R/M, cause I am not elf enough to be WD/S.
Oh, and people who have more than 3 classes are clinically insane.