If you're having problems logging in and out I think its been caused by the moving of the domain registrar and hosting, we need to wait approx 24/48 hours for it all to fully propagate.
You could try clearing cache/cookie's and re-starting browser.
If it don't sort itself out by Monday I'll look further into it. In the meantime I've posted the problem on SMF forums.
Sorry for the inconvenience.
Sic.