First I saw here people getting problems with
www.myforum.com and myforum.com I tought to my self: "I'm gonna check this out at mine" and the same happens here.
Ok, I agree the mod should deal with that but there's is another issue on the backstage that I realized.
For SEO both
www.myforum.com and myforum.com should be pointed to the same address to avoid double links SEO and in my case I forgot that completelly, so I will include a 301 redirect on my .htaccess to redirects all myforum.com links to
www.myforum.com ones. That should solve this issue with this mod as well.
Maybe some of you guys with the same problem with this must do the same thing, may be the opposite as 301 redirects you
www.myforum.com to myforum.com.