http://community.invisionpower.com/topic/331622-download-default-signature-in-posts-offor-members-under-a-certain-post-count/
update ibf_profile_portal set signature = " my default signature info " where signature=''
You probably have it set all wrong. Go to your settings page for this hook and look where it says "How many posts a user must have in order to have a default signature in his/her posts?" , set it to "0" (without quotes of course)
And where it says "Exluded Groups!" , don't select one of you member groups.
Yes you can run this sql command:
PHP:update ibf_profile_portal set signature = " my default signature info " where signature=''
Be sure to change the my default signature info to what you want.
ALSO backup up the ibf_profile_portal table before running this command!!!
You may or may not have the prefix ibf_ ... You can remove it from table name if needed.