[evenmonkeys]

Alright- I think I got most of what you need working here. Before you do anything, please please please make a backup of your database; your post table at the least.

First of all...
In SHOWTHREAD, replace:

							<if condition="$bbuserinfo['signature']">
								<div style="float:$stylevar[right]"><label for="cb_signature"><input type="checkbox" name="signature" value="1" id="cb_signature" tabindex="5" checked="checked" />$vbphrase[show_your_signature]</label></div>
							</if>

With:

				<input type="hidden" name="signature" value="1" id="cb_signature" />

In newreply, replace:

						<if condition="$bbuserinfo['signature'] != ''"><div><label for="cb_signature"><input type="checkbox" name="signature" value="1" id="cb_signature" tabindex="1" $checked[signature] />$vbphrase[show_your_signature]</label></div></if>

With:

						<input type="hidden" name="signature" value="1" id="cb_signature" />

In newthread, replace:

						<if condition="$bbuserinfo['signature'] != ''"><div><label for="cb_signature"><input type="checkbox" name="signature" value="1" id="cb_signature" tabindex="1" $checked[signature] />$vbphrase[show_your_signature]</label></div></if>

With:

						<input type="hidden" name="signature" value="1" id="cb_signature" />

In pm_newpm, replace:

						<if condition="$bbuserinfo['signature']"><div><label for="cb_signature"><input type="checkbox" name="signature" value="1" id="cb_signature" tabindex="1" $checked[signature] />$vbphrase[show_your_signature]</label></div></if>

With:

						<input type="hidden" name="signature" value="1" id="cb_signature" />

That should be it for the template modifications. There might be another one or two- so if you still notice anyone without signatures, let me know and I'll see if I can find some more. Now we need to edit the database. This is the point where you need to have made a backup. I really do not want you to lose your posts if something goes wrong.

All we're doing is replacing all 0's with 1's in the showsignature field in the post table. You can do that via "Execute SQL Query" of the adminCP. In Manual Query, enter this:

UPDATE post SET showsignature='1' WHERE showsignature='0'

Now I'm not too keen on how vBulletin and PHP plays together so you'll need to manually edit your tablename if you have a prefix. For example, if your prefix is "site_" then you'll want "site_post" instead of "post".

Make sense? After that, you should be all good to go. They won't be able to select no signature anymore, and all posts to date will show signatures. =D

Any questions? Let me know. Feel free to use my messengers as well if you need quicker help.