found the answer.. add the following code to your bulletin .htaccess file. it will prevent it from being cached. also, make sure you add the folder for the forum to the block list on the page caching tab.
# Set Expires to default 0
ExpiresActive On
ExpiresDefault A0
# No caching
<FilesMatch “\.(php|cgi|pl|htm|html)$”>
ExpiresActive Off
Header set Cache-Control “private, no-cache, no-store, proxy-revalidate, no-transform”
Header set Pragma “no-cache”
</FilesMatch>