Planet13 - 4:22 pm on Jul 19, 2013 (gmt 0)
Do you mean this:
Step 1) Visitor enters your site through a forum page (which DOESN'T have google analytics tracking code).
Step 2) Same visitor then goes from a forum page to a non-forum page (that DOES have google analytics tracking code).
If so then I thought they would be considered "direct" traffic. At least that is what I thought.
But really, you should put the google analytics code on your forum pages, too.