Klient won't work for me

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I have tried getting Klient to work a few times - it worked during 2nd open beta, but after retail release I just can't get it to work.

I've done what it says on the main kilent post:
You can fix this by simply opening up the plugs.ini file (located in your Klients folder) with notepad and removing the lines "MtpChat Login=" and "MtpChat Password=".

And also set the username and password in the plugins->mtpchat menu, but to no avail. Anyone got any ideas?