Anon users shouldn't have OP indicators, as every uid of a guest user would be uid #1.

You can edit the code from:
Code
{if $postrow[post].userid eq $opid}OP{/if}

To:
Code
{if $postrow[post].userid eq $opid && $postrow[post].userid neq '1'}OP{/if}

In:
Code
[gremelin@vnc ~]# grep -r "opid" /home/public_html/forum/
/home/public_html/forum/templates/default/post_gallery.tpl:{if $postrow[post].userid eq $opid}<span class="lmar post-op">OP</span>{/if}
/home/public_html/forum/templates/default/post_top.tpl:{if $postrow[post].userid eq $opid}<span class="post-op">OP</span>{/if}
/home/public_html/forum/templates/default/post_side.tpl:{if $postrow[post].userid eq $opid}<span class="post-op">OP</span>{/if}
/home/public_html/forum/templates/default/post_side.tpl:{if $postrow[post].userid eq $opid}<span class="post-op fr">OP</span>{/if}]

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