In one theme there was a glitch, it was making the Post Preview not show up due to duplicate code. I just fixed it.
You can disable it in User Control Panel (click Profile, then turn Topic Previews off). Here's the link:
http://www.angergeneral.com/forum/ucp.p ... &mode=view" onclick="window.open(this.href);return false;
just turn "Display topic previews" to "No" and it'll disable the preview.
Sorry about that! I can't turn it off by default without disabling for anybody, so follow the above link if you want to turn it off.
Thanks.