Why do profile field variables work in some templates but not all?

[john2k]

If I put $post[field2] as the only text/code in the ad_showthread_firstpost template, the value of that field outputs in that location on the page. Basically, it works.

However, if I put that same exact code, $post[field2] , in the ad_header_logo template, I get nothing at all. On the same exact page view, it works in one location but not in the other.

Why does this work in ad_showthread_firstpost but not in ad_header_logo ? It also does not work in the ad_navbar_below template as well.

Is there something that prevents the use of profile field variables in certain templates?