Sorry to be yet another person complaining about this topic, but I haven't found a fix that works for me.
I tried to move to the EU megaserver and it gave me an error message and started to redownload the entire client from scratch. I then quit the launcher and tried the 'copy the US folder into the EU folder' trick. Started the launcher, it seemed happy, but then had an 'Access invalid' message. I clicked 'Repair' and now it's 'repairing'... by apparently redownloading the entire client again.
I have heard a couple of people say that the way around this is to delete the player file. Which player file would this be (as in, what is it actually called and in which folder can I find it)?
Any help appreciated...