@tysconnect: I am very glad that you got it working, although this sounds really strange to me, because wp-admin. wp-login, etc. are language-neutral urls and they should not be redirected to anything like yoursite.com/de/subfolder/wp-login, they should stay yoursite.com/subfolder/wp-login, although I think a problem like this existed in the past. Which version of qTranslate-X do you use? I could not reproduce anything you both described so far. Maybe my browser is configured differently, somehow. I will try more.
