XF 1.1 URL Messed Up

Can't get this damn thing fixed. I gave my co-founder admin permissions last week, suddenly everything's broken. :cautious:

Anyway, the activation link in emails show up as this: /forum/mydomain.com/forum/whatever.

I took a look in my board options and I also found this: http://d.pr/i/M5Pm (look at default URL).

Here are my Basic Board Information settings: http://d.pr/i/VUGl

Any ideas?

Thanks in advance,