Pictures in Post Function

In Administer>Themes>Configure, you check the box to include user's pictures in posts. However, I have done this. The user picture appears in comments - but does not appear in the intials posts.
I have all types of posts selected except "page" because I use this for "about us" and other pages posted by admin.

Any clues on how to get the user picture to display on initial posts in the blog and forum?

I have a similar problem with Marinelli theme on Drupal 6.4: the user pictures (avatars) appear in some posts, but not others. When they don't appear, there's a blank area where the picture should be that still links to the user profile (i.e. it seems like a blank picture has been inserted). This seems to be a Marinelli theme problem as the avatars display correctly with other themes.

Here's a partial list of where the avatars appear correctly for me:
-blog entries and book pages displayed as a teaser (e.g. on front page)
-forum comments

and where they appear as blanks:
-blog entries and book pages displayed in full form
-initial posts in a forum topic

PS: thanks for the great looking theme!