This Thread is very old, I am sure he have figured it out!
Are you using VBSEO, ? That can cause problems too and uses another method for a LIKE Button,
Here is an example for VBSEO forums:
Code:
<iframe src="http://www.facebook.com/plugins/like.php?href=http://(DOMAIN)$_SERVER[VBSEO_URI]?p=$post[postid]&layout=button_count&show_faces=false&width=&action=like&colorscheme=l ight"
scrolling="no" frameborder="0" allowTransparency="true" title="hihi" style="border:none; overflow:hidden; width:100px; height:20px"></iframe>
I will write back,
ONLY if i found anything else!
Else goodluck